Worcester Bosch Greenstar RD CDi Boiler Automatic Air Vent 87185050140

Product Overview

The Worcester Bosch Automatic Air Vent (Part Number: 87185050140) is an air-release component designed for selected Worcester Bosch heating systems.

The automatic air vent forms part of the boiler's hydraulic system, helping to release accumulated air from the central heating water circuit during operation.

By allowing trapped air to escape, the vent supports proper water circulation and helps reduce air-related problems within the heating system.

Correct operation of the automatic air vent is important for maintaining reliable heating performance.

ℹ️ Product Condition Options:

This part may be available in New or Refurbished condition. Please select your desired option from the dropdown menu above. Refurbished components should be professionally inspected and tested for correct operation and leakage before installation.

Technical Insight & Common Failure Symptoms

The automatic air vent is a mechanical component designed to release trapped air from the boiler's heating circuit.

The vent operates using an internal float mechanism. As air accumulates within the vent chamber, the float lowers, allowing air to escape. When water rises within the chamber, the float closes the valve to prevent water from discharging during normal operation.

Over time, the vent may be affected by internal contamination, corrosion, deterioration of sealing components or problems with the float mechanism.

Possible symptoms that may indicate an automatic air vent or associated heating system problem include:

• Air remaining trapped within the boiler or heating circuit.

• Gurgling or bubbling noises during heating operation.

• Water dripping or leaking from the automatic air vent.

• Vent failing to release accumulated air correctly.

• Reduced water circulation associated with airlocks.

• Intermittent heating performance caused by trapped air.

• Visible corrosion or deterioration around the vent body.

These symptoms do not necessarily confirm a faulty automatic air vent, as similar problems may result from system leaks, circulation faults, incorrect filling procedures or other hydraulic components. Correct professional diagnosis should be carried out before replacement.

Compatibility

This part (MPN: 87185050140) is associated with selected Worcester Bosch Greenstar, RD and CDi boiler systems.

Please verify the exact boiler model, GC number, part number, connection arrangement and component specifications against the manufacturer's technical documentation before ordering to ensure correct fitment.

Safety Advice

Boiler automatic air vents and associated hydraulic components should only be inspected, removed or installed by a suitably qualified and competent heating engineer.

Always isolate the appliance and allow the heating system to cool before carrying out any work. The relevant heating circuit must be safely isolated and depressurised before removing the vent. Follow the manufacturer's servicing instructions and complete all required pressure, leakage and operational safety checks before returning the boiler to service.