Common Vaillant boiler error codes

When a boiler error code pops up and your home is left without hot water, it can seem like the world is falling. While this is a rarity for Vaillant boilers, it’s worth knowing what certain error codes mean and how to resolve them. 

Some boiler error codes can reveal issues that need heating replacement parts, boiler spares or a visit from an engineer. In these cases, shopping for boiler parts and spares is much more cost-effective option than getting a full boiler replacement. 

There are hundreds of possible error codes that your Vaillant boiler might display. However, in this blog we’ll just be covering the common ones people are likely to see in their homes.

What are Boiler Error Codes? 

A boiler error code signifies something has gone wrong which is preventing the boiler from working properly. They appear as alphanumerical (1-10 and A-Z) codes on the boiler display. 

In Vaillant boilers, error codes are divided up into categories that detail possible error types. These include: 

• Maintenance codes – When a maintenance code shows, it signals the boiler should be examined by a qualified engineer. The boiler will continue working while the code is displayed. 
• Blocking errors – these errors signal there’s a pump blockage in the boiler system that needs to be addressed. 
• Fault errors – usually shown as ‘F’ followed by a number. The number in the fault error relates to the system area that is experiencing the fault. 
• Locking errors – this occurs when the boiler displays a red flashing light, which shows that it has gone into lockout. Upon resolution of a locking error, boiler reset must be performed. 

List of Common Vaillant Boiler Error Codes 

F.29: No Flame Signal

This can be due to the flame going out or an error with flame detection systems. There can be many causes behind a loss of flame signal. This includes a broken gas valve, defective connecting/ignition lead or frozen condensate discharge pipe. Check the pilot light or flue duct to confirm an F29. 

F.28: Insufficient Gas in the System 

An F.28 error code prevents the Vaillant Boiler system from operating. It could be caused by other issues such as defective ignition leads, electrodes or electronic ignitors. For properties operating with a smart meter system, an F.28 error code can be displayed when the gas allowance runs out. 

F.22: Low Water Pressure 

There’s an insufficient amount of water in the system and/or a fault in the pressure sensor or ventilation system. Vaillant recommends topping up the water in a boiler once or twice a year to maintain pressure. This can be done easily on boiler systems with an auto feed. Oftentimes a boiler auto feed stops working and you need boiler parts and spares to replace it. 

F.24: Pump Fault 

An F.24 error can mean a boiler system is running with air as a result of an internal blockage problem. This can create further issues due to there being an uncontrolled ratio of air and gas. For combi boilers, homeowners can resolve the issue by pressing the heat control reset button. 

F.32: Fan Error

The fan speed in the boiler is either too high or too low. A simple restart should remove the F.32 error code. If not, professional help may be required as the issue may lie with the cable harness or a blockage. 

F.20: Temperature limit reached 

The boiler needs time to cool down and return to a reasonable operating temperature. A potential cause would be a faulty connection between the boiler and cable. 

F.61: Defective Gas Valve Control 

Issues might arise when a Vaillant boiler gas valve has been assembled incorrectly. Another possibility is the cable loom that connects to the gas valve has short circuited. New boiler parts can replace the gas valve in an attempt to solve the problem. 

NTC Errors: F.00/F.01/F.10/F.11/F.13 

All these codes reflect that a boiler’s Negative Temperature Coefficient Thermistor (Flow NTC) needs to be replaced, either due to damage or defectiveness. 

Find Vaillant Boiler Spares Near me

Many common Vaillant boiler error codes can be resolved with the relevant boiler spares. NBS have a large range of Vaillant boiler parts and spares available for delivery, wholesale, and distribution worldwide. 

Our prices are affordable so unexpected Vaillant boiler error codes can be fixed without any added stress. Get in touch today and find the boiler parts you need.