Author: NBS Admin

Vaillant boilers are mostly extremely reliable, but even the very best boilers will start to become less efficient with age and things can sometimes go wrong. The F75 fault on a Vaillant boiler is one that often comes up on older ecoTEC models due to some teething issues with the pressure sensor and pump during its initial release in the early to mid-2000s. Poorer quality products were used for these parts which has resulted in some homeowners experiencing the F75 fault on their boiler. 

However, even if your boiler isn’t that specific model, it can still develop a fault with age. So, if unit is more than 7 or 8 years old you will want to take extra care to ensure your system stays in good condition until you’re ready to replace it. In this article we will be exploring what the F75 fault means and how it can be fixed so you can be prepared should you ever face the error code on your boiler. 

What does the F75 fault mean and what can cause it? 

If your boiler is showing the Vaillant F75 error code, it essentially means that the boiler is unable to detect any water pressure and therefore can’t distribute the water around the central heating system or through the pipes. This can be caused by there not being enough water in the boiler, so the pressure is too low to be recognised by the sensor. Or it could be that there is a problem with the pressure sensor itself or a fault with the pump. 

Can you hear a low humming and vibration noise coming from your boiler normally? If so that’s a good thing! It means your pump is working as it should be. If the cause of the F75 fault lies with the pump, then you won’t be able to hear any sounds coming from it.  Whereas if the pump starts making its normal noise at first but then stops and you don’t have hot water, the problem will probably be the pressure sensor. 

One of the most common reasons why you can end up with a faulty pressure sensor is because of old boiler water, limescale, rust, and general debris collecting on it over time. When this happens the sensor can’t effectively detect the pressure from the pump which ultimately leads to the F75 fault code being displayed. 

How to fix an F75 fault on a Vaillant boiler 

The first thing to try if you see the F75 fault on your boiler is increasing the pressure in your boiler by topping up the system with water using your filling loop. Even if the pressure drops again and you get the same error shortly after you can rule out the possibility that there simply wasn’t enough water in the system for the sensor to detect as now you can be certain there was. 

If you reset your boiler, you can follow the above-mentioned steps of listening out for the normal pump sounds as a way of potentially locating the source of the fault. If you cannot hear the pump working as it typically would then this is likely the cause of the error code and you will need to call a Gas Safe engineer to come out and replace the pump. 

Equally, if the boiler pump is working fine and it is the pressure sensor that is the issue you will still require an engineer to resolve this problem. However, you will have two options in dealing with the sensor, the engineer could clean it for you, or they could replace it with a new one. It might sound surprising, but the latter is actually the cheaper route to go down as it requires more labour to clean a sensor and remove all the debris. 

Is there any way to avoid the F75 fault? 

Given that the causes of this fault are mostly down the functionality of some key boiler parts there isn’t a lot you can do to stop the Vaillant F75 fault code from appearing. However, one thing you are able to do is ensure that your boiler is regularly serviced every year. This will give the engineer the opportunity to check that the pump is in good working order and clean any minor debris or limescale build-up that they see on the sensor before it has a chance to get worse and show the fault. Also, it never hurts to check your pressure gauge every once in a while, even if your boiler is working normally. 

Conclusion 

It’s normal to worry when you see an error come up on your boiler, replacing a boiler and even new boiler parts can be expensive. However, at NBS we provide high quality boiler replacement parts at competitive prices. No matter what type of boiler you have we’ve got boiler spares that will be exactly what you need. Explore our online shop to find the part you need or if you’re unsure, get in touch with our friendly team today. Also, check out some of our other guides if you are experiencing issues with other Vaillant boiler fault codes.  

  

Even though in the vast majority of cases the cause of low boiler pressure is a leak of some kind, whether it is big or small there are other reasons why your boiler pressure has dropped. If you can be fully sure that you don’t have a leak anywhere in your boiler or central heating system, then it’s important to find out why your boiler has lost pressure so it can be fixed quickly and effectively. In this article we will be looking at the other causes of pressure loss in detail to help you get an insight into what might be affecting your pressure. 

Expansion vessel

When your heating system is on, the water starts to expand, and the vessel works by removing that water expansion from the heat. The expansion vessel contains a lot of air and counteracts any increasing pressure that might occur in your pipes or radiator. However, if the vessel is never repressurised or a fault develops with the part the pressure within your boiler system will be affected. 

More often it will be that the pressure actually rises too high when there is a fault with the expansion, but this in turn signals the pressure relief valve (PRV) to release all the pressure, leaving it at 0 bar. A problem with the expansion vessel is not something you can diagnose yourself and will require a specialist Gas Safe registered engineer to resolve the problem. 

Pressure gauge 

It is a pretty uncommon issue but occasionally there could be a problem with your boiler’s pressure gauge. This means that the part is unable to detect the correct level of pressure in the system and can be problematic if you continuously repressurise the boiler when you don’t need to, leading to more serious damage. If you notice that the gauge doesn’t change when you increase the pressure on your boiler and the cause isn’t a leak, then it could well be a fault with your gauge, and you will need a boiler pressure gauge replacement. 

Filling loop left open or faulty 

If you attempt to repressurise your boiler when you see the pressure drop to below 1 bar it’s important to make fully sure that you have closed the filling loop completely. When the loop is left open even slightly it can mean too much water will flow into the system and affect the pressure. If you are certain that the valve and loop were shut off as far as they could go it might be that they have become worn over time or dirt has got in and is preventing them from closing all the way. In any case, the valve should be checked and potentially replaced if required. 

Pressure relief valve 

The pressure relief valve in your boiler acts as a safety device, releasing a build-up of pressure if it becomes too high. If the valve isn’t functioning as it should be the boiler will start to leak and the pressure will drop. It’s important that every other possibility has been checked before the pressure relief valve is replaced. This is because if the valve is replaced and the pressure keeps increasing then something else is making the pressure rise and your new valve will start leaking too. You can find high quality boiler pressure relief valves at NBS. 

Conclusion 

Going back to the overarching question of this guide, yes! A boiler certainly can lose pressure without their being a leak. As we have seen above, if you don’t have a leak in your boiler system it could be a fault with one of your parts that needs checking. At National Boiler Spares we are committed to providing quality and affordable new and refurbished boiler parts. 

Reusing spare parts for boilers that are in good working order is not just more cost effective but is also environmentally friendly too. Not sure what part you need for your boiler? Don’t worry, our team are on hand to help you find the exact component you need to get your boiler up and running efficiently. Simply contact us if you have any questions. 

  

When a piece of equipment has a fan inside or as part of it, normally the role of that fan is to cool things down when the equipment becomes too hot. This is not the case in boilers though, the purpose of a boiler fan is to ensure any toxic fumes are blown safely up and out of the system. The fan is an essential part of a boiler and in this article, we will be exploring exactly what it does, why it is important, and some common faults that can go wrong with them.

What is the role of the fan on a boiler? 

If you have ever noticed that your boiler has a fan you might be wondering exactly what its function is, or if you’re having problems with your boiler fan what can be done to fix it. The normal workings of a boiler involve burning different fuel types in the combustion chamber. 

By doing this harmful gases are released and need somewhere to go. Gases typically leave the system through a flue which is a large white pipe that directs the fumes out of the boiler. The flue gives the gasses an exit, but it is unable to move them out itself. This is where the fan comes in and helps to blow the gases through the flue and make sure that they are safely released. In addition, the fan stops flue gases from settling on the heat exchanger’s intake pipe, which can cause corrosion on top of other serious problems. 

Are there safety mechanisms in the boiler fan? 

The boiler fan starts up before any other elements as it is a crucial safety feature and needs to be operating correctly for your boiler to work both effectively and safely. However, boilers are designed with safety mechanisms in place to ensure the boiler does not try and fire up with a faulty fan. 

For example, the fan is required to be registered as functional by the printed circuit board (PCB). The PCB registers the fan using an air pressure switch, so if the fan is not registered as operational, the boiler won’t start, and it will show a fault code on the display panel. 

If a fault is found the boiler system as a whole will lock to stop any chance of a fire or malfunction as well as to avoid any more damage to the unit. In the situation of being locked out of your boiler, you will need to get in touch with a Gas Safe engineer to come out and repair the issue. 

Is it dangerous to have a faulty boiler fan? 

If there is a problem with your fan and it is not identified by the PCB, then it can certainly be dangerous. There is the possibility of fire in your home or carbon monoxide poisoning, but if you have a carbon monoxide monitor in place you can easily prevent the latter. However, the fan starts before any other part of the boiler, so if that start fails, the boiler will shut down, lock, and show an error message. This means it is unlikely that there are any significant dangers related to faulty boiler fans. 

Common fan fault causes and how to repair them

Low fan speed 

If your fan speed is low, this can lead to problems like the pilot light going out briefly after being ignited or you can be fully locked out. The only way to resolve a low-speed fan is to contact a Gas Safe engineer to come out and fix it. 

Blocked condensate pipes 

Condensate pipe blockages can happen during winter due to freezing in cold conditions. The role of these pipes is to remove damaging vapours from the system, so if they become blocked, the air pressure will fluctuate and the boiler registers different fan faults. 

Fixing this issue will involve thawing out the pipe because it will likely be blocked by frozen vapours. When it has thawed, it is advisable to insulate it. If you live in an area that is especially prone to cold weather, you might want to contact a professional and seek advice on the most suitable type of lagging to use. 

Malfunctions in the air pressure switch 

If there is a malfunction in the air pressure switch, the boiler won’t fire up as it can’t register that the fan is working properly. As long as the system doesn’t have any blockages and the only problem is the switch, it can easily be solved by replacing the switch. 

Loose connections 

Sometimes wires and connections can get looser over time due to the fan producing small vibrations. There is a possibility that you might get locked out of the boiler if there is a loose connection between the PCB and the fan as it won’t be able to register the working condition of the fan. 

The solution to this is asking an engineer to look out for any potential loose connections or wires and request that they service the boiler at the same time. Therefore, they will be able to tighten loose connections and resolve any other smaller problems they come across. 

Boiler leaks 

As frustrating as it is, leaks are quite common developments in boilers. If they are not found promptly, boiler leaks can cause extensive damage to components including the fan, which will result in the boiler not working. If the cause of the fault is corrosion from a leak, an engineer will need to locate the leak, fix it, and replace any affected parts like the pump seal or heat exchanger, and it might be necessary to replace the fan too. 

Faults with the circuit board 

Despite it being very unlikely, if all other possible causes have been explored, it could be that the PCB is transmitting incorrect messages to different parts of the boiler like the fan. To resolve this, your engineer should analyse the PCB using a multi-metre, as it might be that there are a few loose connections. If it is found that the connections are secure, the unit will need to be replaced. However, this can be expensive, so be sure to do your research as it could be more worthwhile to replace the boiler. 

Conclusion 

The fan inside a boiler is an essential component that needs to be in working order for the system to function as a whole. If you’re having problems with your system and are looking for high quality, affordable boiler parts, National Boiler Spares can help. 

We specialise in providing refurbished boiler spare parts to help people find the exact components they need for their specific system without the worry of how expensive it will be. Explore our wide range of parts to find the one that is right for your boiler. 

When any error code comes up on your boiler you will probably be concerned, thinking about the cost of getting an engineer out to repair the problem, or even worse, have to buy a new boiler. However, F1 is one of the most common issues with boilers and you will likely be able to fix it yourself if you know how. That’s where this guide comes in, here we will be exploring exactly what the F1 fault means and what you can do to sort it out. 

What does the error code F1 mean? 

Essentially, if you are getting an F1 code display on your boiler it means there is a lack of pressure within your system, which is likely because there is not enough water. If you see F1, there could also be flashing lights on the front of your boiler and the system won’t work again until you increase the pressure and reset it. 

What can cause an F1 boiler fault code? 

In the most basic situation where the pressure drop is just a one-off occurrence, all you will need to do is put water in the system using a filling loop. However, if the pressure in the system keeps falling, it could indicate that you have a leak. The leak will need to be repaired before you try to increase the pressure or your boiler and maybe even your house could be vulnerable to water damage. 

How to fix an F1 fault on a boiler 

You might need to get in touch with a Gas Safe engineer, depending on the specifics of what is causing the reduced pressure. This will definitely apply to any step that involves the boiler being taken apart. 

Check the pressure sensor 

If the pressure gauge of your boiler is between 1 and 2 (1.5 bar is the optimal boiler pressure for a properly working heating system), then the pressure is not the overall issue. The role of a water pressure sensor is to inform the Printed Circuit Board (PCB) whether the pressure is too low or high. So, if the sensor is giving the PCB wrong signals, the boiler will stop working and show the F1 boiler error code. 

Determine pressure loss or not enough pressure 

If the pressure gauge is telling you that the pressure is low and it is confirmed that your sensor is not the cause, you will need to find out if the problem is coming from pressure loss or there not being enough pressure in the first place. In the case of lacking water pressure, you can top up your boiler with water using the filling loop. 

However, if your boiler is consistently dropping in pressure, it likely means there is a leak. If you don’t repair the leak before attempting to increase the pressure of the boiler, you might end up with costly repair bills as the internal boiler components can become damaged by the leaking water and potentially even your walls and floors, if the leak is originating from pipework. 

At 1.5 bar, a boiler should be stable and working normally, but if the gauge reads less than 0.5 bar the boiler will display an error message and stop working. Therefore, you will want to ask yourself if the boiler is dropping in pressure after it has been topped up. 

Identifying leaks 

Of course, the next step would be to look for any leaks in the boiler. If you have contacted an engineer, they will probably examine things like towel rails and radiators checking for pinholes, copper pipework looking for loose joints or pinholes, and the boiler’s heat exchanger and pump. A lot of the time, the source of the leak will be one of those parts, if a leak is located it needs to be fixed as quickly as possible.

Bleeding the radiators and increasing boiler pressure 

When topping up the boiler with water via the filling loop, you should keep an eye on the pressure gauge as the pressure increases. It’s important to note that as your heating system is being filled with water, air will get in as well. This leads to a blockage forming in your system that needs to be removed. 

Getting rid of the blockage will require you to bleed your radiators at the same time as topping up the boiler, so you may need some help from someone else during the process. The pressure will drop when you’re bleeding the radiators, so be sure to keeping adding water to the boiler as well as bleeding them, until all the air has been released. 

Clearing the F1 code 

Once you have found and repaired any/all leaks, increased the pressure of the boiler, and bled all the radiators, the last thing you need to do is remove the F1 code displaying on your unit and reset the boiler so it can start functioning normally again. 

Summary 

We hope you have found this guide useful, and it is the answer you were looking for to fix your boiler. If you are having other problems with your heating system and need boiler parts, NBS can help. With us, you can find the exact boiler spares you need at a much cheaper price than buying a new element, and it will come with a 12-month warranty for extra peace of mind. Explore our website today and don’t hesitate to contact us if you need help finding the part you require. 

 

 

When you’re a homeowner, there are some important things that you need to know just in case they ever go wrong and resetting a boiler is one of those things. By understanding and looking after your Worcester boiler now, you could save yourself an expensive call out charge or repair bill further down the line. In this article, we will be explaining how to reset a Worcester boiler as well as some of the common error codes you might see come up. 

Why is knowing how to reset a boiler important 

Getting to grips with the workings of your boiler and being able to reset it, if necessary, could make sure you’re never left cold on a winter night. A lot of boilers lose power every now and then without there being a specific fault behind it, and simply resetting the system will rectify the issue.  

However, if an error code comes up, then you will need to check your boiler manual to see what the problem is and potentially get in touch with a boiler repair engineer who will be able to look at it for you.  

Resetting your Worcester boiler 

If you need to reset your boiler, all you need to do is press and hold in the reset button which is usually located on the front of your boiler control panel. Hold down the button for around 3-5 seconds to give the system a chance to fully reset before you check to see if it is working normally. Some boiler models may come with a light rather than a reset button.  

You can find this on the temperature dial, and it will require you to turn the dial fully down until it reaches the reset light. Once it is set on the reset light, keep hold of the dial there for 3-5 seconds before putting it back to its normal place and letting the boiler come back on.  

Common Worcester boiler error codes 

Worcester boilers are high quality and built to last, but like any other boiler, they do have a few common faults that you might expect to see on the display screen during its lifetime. The most common error codes are: 

• EA: this means the boiler is not ignited, so you can try and reset it before seeking support. 
• D1: this is alerting you that there is overheating or a damaged sensor, this requires expert assistance straight away. 
• E9: this suggests possible damage to the main heat exchanger, a professional engineer is required to check this immediately. 
• C1: this code will come up when you have a damaged fan, you should ask an expert engineer for support straight away. 

• A1: this code means there isn’t enough water in the system, the pressure gauge should be checked and if the system is cold, you can re-pressurise the system. If this does not work, call out an engineer. 

 Keeping your boiler in good condition 

One important thing that many boiler owners want to know is how to keep their boiler in good working condition so that it lasts for as long as possible and doesn’t end up costing you more money than you can afford. The best thing you can do to ensure this is get your boiler serviced every year.  

An annual service will give you regular peace of mind that everything is working normally and potentially get ahead of any problems the engineer might find as they check the system. Most issues that do come up can be easily solved, in a lot of cases the engineer can carry out the work on the day after inspection. 

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What can NBS do for you? 

At National Boiler Spares, we offer new genuine boiler parts for a wide range of systems whether you have the latest Worcester boiler model or an older version. In addition, we can also provide a refurbishment service for your old spare boiler parts at a fraction of the cost of new ones with a 12-month warranty for extra reassurance. Contact us today if you need help finding the right parts for your Worcester boiler. 

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Combination or combi boilers have become the most popular and commonly sold type of boiler. This is because water is heated on demand when a hot tap is turned on, meaning you don’t need a hot water storage cylinder, which makes them the ideal choice for homes where space is more limited. 

Like the name suggests, this type of boiler works by combining a water heater and central heating boiler into one single unit. If the thermostat in the room alerts the boiler to fire up because the temperature has dropped below a set point, the boiler will start so that heat can be put into the central heating system. When the set point of the thermostat is reached, the boiler will turn itself down to ensure the heating stays at the correct temperature and prevents energy waste.  

If someone in the home turns on a hot water tap, heat is sent into the domestic water supply by a valve to continuously provide heat until the tap is turned off. The valve will then go back its standard position of sending heat to the central heating system. Heat can be delivered to either the central heating or the hot water taps, but it can’t do both at the same time.  

Is a combi boiler the right choice for your home? 

To work at their best, combi boilers rely on good mains water pressure so they can provide a steady water flow rate, if you have low pressure the hot water will only drip or trickle out. If your mains water pressure is especially low or your property includes multiple bathrooms, an alternative boiler like a system boiler could be a better choice for you.  

You also need to make sure that the heat output of the boiler is suitable for your usage. Combi boilers output heat in two ways: one for hot water and one for central heating. It takes more heat and effort to create hot water in comparison to heating radiators, so it will typically come down to hot water output when deciding on a boiler.  

What are the benefits of combi boilers? 

• Simple to use- the majority of combi boilers have very basic controls. Thanks to the time and temperature controls, you can plan ahead for the heating to come on when you need it, at your preferred temperature, giving you more control, and helping to lower your energy bills. 
• Everything you need to provide heat to your radiators or hot water to your taps is all inside the boiler case. Therefore, you won’t need to find or make space for a hot water storage cylinder or central heating pump which is perfect for smaller homes who don’t need a big tank taking up a lot of their already limited room. 
• Due to not needing a tank in the loft or a hot water storage cylinder, an extra perk of a combi boiler is you don’t need as much pipework which will save you time and money when having it installed.  

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 Combi boiler FAQs 

Do you need a separate hot water cylinder? 

No, because a combi boiler only heats water when you need to use it through your taps or shower, so storing water for later use is not necessary. 

Can you have a combi boiler if you have LPG? 

Yes, there are dedicated LPG models of combi boiler on the market so that house that are not on the mains gas grid can access the benefits of an efficient combi boiler without any hassle.  

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Summary 

We hope you have found this guide into how combi boilers work helpful. If you’re having a problem with your boiler and don’t want to have to pay a lot of money for a new part, National Boiler Spares can help. We provide refurbished boiler spare parts for a wide range of boilers at affordable prices. Contact us today if you need help finding the right boiler parts for your unit. 

 

 

The majority of modern boilers often don’t need much more attention than their annual service and the occasional look at the boiler pressure gauge to inform you of the water pressure circulating in the heating system. Keeping your boiler at the right pressure is extremely important as if the pressure is too low, the system won’t work as efficiently. In this article, we’ll be answering whether having low boiler pressure is dangerous and how it can be fixed.

 

What should your boiler pressure be?

Normal boiler pressure should sit somewhere between 1 and 2 bars. The right boiler pressure is typically marked as a range in green on the pressure gauge, with red being the low and high boiler pressure zones. Your boiler might keep working if the pressure is in the red zone but if it’s shutting itself down or won’t turn on, then you’ve got a problem.

Even when your boiler is working as it should be, it’s advised to occasionally check the pressure. As well as this you should know how to use your boiler pressure relief valve to release boiler pressure when it’s too high and how to increase the pressure when it’s too low.

 

Is low pressure in your boiler dangerous?

You will be able to tell when your boiler pressure is too low if:

• There isn’t any heating or hot water
• Your radiators aren’t heating up properly
• The dial on your pressure gauge has dropped

The good news is that low boiler pressure isn’t a danger. Sometimes, central heating systems can develop small leaks, similar to a tyre having a slow puncture. You might not notice any water escaping, but over time the pressure in the system keeps falling until it is too low.

If you have recently bled your radiators, you might notice the boiler pressure falling. Bleeding the radiators gets rid of any air within the system, which can lead to changes in the boiler pressure. Despite there not being a danger, you could be wasting a lot of money on your energy bills if your boiler pressure is too low, so it is important to address it.

 

How to increase your boiler pressure when it’s too low

Fortunately, you can usually increase your boiler pressure yourself without having to spend money on an engineer. If you have already done some research into this, you might have seen it referred to as ‘re-pressurising’ your boiler. Following the below steps can help you top up your boiler pressure:

• First turn off the boiler
• Look for an external filling loop underneath the boiler – it is normally a short length of braided hose connecting two water piper with levers at both ends to operate valves.
• If you can’t locate a filling loop, your boiler might have a keyed filling loop or a keyless internal filling loop instead, you should check your boiler’s instruction manual if you can’t find it.
• Turn both valves so that the levers are in line with the direction of the braided hose. You should hear water running and see the boiler pressure gauge increasing.
• At around 1.2 bar, turn off both valves.
• As long as the pressure stays up and there aren’t any obvious indications of leaking water, it is safe to turn the boiler back on.
• After the boiler has been on and had the time to cool down again, check that there hasn’t been any significant pressure drops.

Normally, you should not need to increase your boiler pressure very often. However, if it is dropping more than once or twice a year, you should look at all visible pipes for any signs of water leaks. You might also see green deposits close to joins in copper pipework or stains on the skirting boards or ceilings. If you see a leak or your boiler pressure continues to drop, it probably requires further investigation by an engineer.

 

Summary

Even though low boiler pressure isn’t dangerous, it’s still important to get the pressure back to normal as soon as possible. If you need affordable boiler parts to fix a problem with your boiler NBS can help. We offer a wide range of boiler spare parts that will not only help you get your boiler back up and running effectively quickly, but also save you a lot of money on buying parts too. Contact us today if you have any questions or need help finding the right part for your boiler.

 

The majority of modern boilers often don’t need much more attention than their annual service and the occasional look at the boiler pressure gauge to inform you of the water pressure circulating in the heating system. Keeping your boiler at the right pressure is extremely important as if the pressure is too high, there’s more chance of leaks forming in the system. In this guide, we’ll be answering whether having high boiler pressure is dangerous and how it can be fixed.

 

What should your boiler pressure be?

Normal boiler pressure should sit somewhere between 1 and 2 bars. The right boiler pressure is typically marked as a range in green on the pressure gauge, with red being the low and high boiler pressure zones. Your boiler might keep working if the pressure is in the red zone but if it’s shutting itself down or won’t turn on, then you’ve got a problem.

Even when your boiler is working as it should be, it’s advised to occasionally check the pressure. As well as this you should know how to release boiler pressure when it’s too high and how to increase the pressure when it’s too low.

 

Is high pressure in your boiler dangerous?

You will be able to tell when your boiler pressure is too high if:

• The pressure gauge has increased or moved into the red zone
• The system has shut down completely

There are a number of reasons why you may see the boiler pressure increasing to 3 bar or more:

• You might have unintentionally added too much water when trying to fix low boiler pressure.
• The filling valves have been left open accidentally or haven’t been screwed them closed tight enough, which allows water to keep flowing through.

High boiler pressure is not usually dangerous as the heating system is protected by a boiler pressure relief valve (PRV). This valve stops damage from occurring by letting water escape, in some cases through a small pipe via the external wall close to the boiler, when there is too much pressure. Also, a lot of systems are designed to shut down if the pressure becomes too high.

 

How to reduce boiler pressure when it’s too high

If the problem doesn’t seem too serious, you can try to self-diagnose the problem with your boiler and low the pressure in a few easy steps:

• Turn the boiler off
• Check that the filling loop valves, or the key/keyless filler, are completely and securely closed.
• Wait for the system to cool down, then release pressure by bleeding each of your radiators. Take care as it’s easy to do this wrong, if you’re unsure or make a mistake while bleeding the radiator such as the pin gets stuck or you are unable to get in back in the valve, call a professional immediately.
• Once every radiator has been bled, check the pressure gauge. If it is still too high, you will need to bleed one or more of the radiators again.
• Keep checking until the pressure gauge shows around 1.2 bar or at the very least has gone back to the green zone.
• If the boiler pressure is too low, refer to our other guide that discusses how to increase low boiler pressure, but always make sure that you close the filler valves afterwards.

In the event that your boiler pressure keeps increasing into the red zone, it’s best to call out an engineer. This is because it could be an indication of a problem with the pressure relief valve or a fault within the system. A Gas Safe Engineer will be able to identify and repair the problem, so you’re never left without heating or hot water.

 

Summary

Even though high boiler pressure isn’t dangerous, it’s still important to get the pressure back to normal as soon as possible. If you need affordable boiler parts to fix a problem with your boiler NBS can help. We offer a wide range of boiler spare parts that will not only help you get your boiler back up and running effectively quickly, but also save you a lot of money on buying parts too. Contact us today if you have any questions or need help finding the right part for your boiler.

When picking a boiler, it is important to understand the different types of boilers and which boiler is the right choice for your home. There are 3 main types of boilers: 

• Combi Boiler
• Heat Only Boiler 
• System Boiler 

Whether you are replacing your current boiler due to its age or needing a boiler system that can meet your demands you should always understand what makes each boiler different before deciding. if you choose a boiler bigger than your needs you could see an increase in bills due to the increase of energy that you may not need nor afford. 

Heat only Boiler 

What is a heat-only boiler? 

Heat-only boilers, also referred to as open vent system boilers, or regular conventional boilers, are usually found in properties that are large or require a higher demand for hot water need to multiple bathrooms or for two or more showers at the same time.  

A heat-only boiler uses numerous controls to distribute hot water throughout the home including valves, pumps, and tanks. Compared to a Combi boiler, heat-only boilers are bulky and require a hot water cylinder, cold water tank (usually stored in the loft), pumps to circulate the water, and an expansion tank maintains the levels of water needed for the heating system. 

If you require the need for multiple taps or bathroom facilities to be used at the same time or your home is large in size with a number of people living in the home then a heat-only boiler would be beneficial for your home. We stock a range of heat only boiler parts including baxi heat-only boiler parts which means if your boiler ever has an issue you will be able to easily replace the required boiler part instead of replacing the whole system. 

 

System Boiler  

What is a system boiler? 

System Boilers are very similar to Heat Only Boilers however there is a big difference between how both boilers function. System Boilers also require external systems and controls such as a water cylinder for storage however, they differ from a regular boiler as the system boilers system uses a pressurised heating circuit which is topped up by mains water, unlike a heat-only system which uses a feed and expansion tank. 

A System boiler can deliver a high volume of heated water to multiple taps just like a heat-only system however, a system boiler can utilise the water supply from the mains directly without requiring a cold water tank, making it a more compact system than a heat-only system.  

Combi boilers provide hot water on demand, whereas, systems boilers have a cylinder to provide hot water for later use. If you only have one bathroom you may opt for a combi boiler but if you have multiple bathrooms and a large household you should opt for a system boiler as system boilers have the capacity to store water for a period of time, allowing the system to easily manage numerous heated water facilities and functions at once in including radiators and taps. We supply a range of boiler parts for systems boilers including Vaillant system boilers and Ideal boiler systems.