What does the Glow-worm Flexicom F22 fault code mean?
The F22 fault code on a Glow-worm Flexicom boiler indicates a dry fire condition or low water pressure within the system. This typically means that the boiler is unable to detect sufficient water flow, which can lead to overheating and potential damage if not addressed.
Common Causes
- Low Water Pressure: This can occur due to leaks in the system, a faulty pressure relief valve, or insufficient water supply.
- Air in the System: Trapped air can prevent proper water circulation, leading to low pressure and triggering the F22 fault code.
Can I fix it myself? (DIY)
You can attempt to fix the low pressure by checking the pressure gauge and re-pressurising the system if it is below 1 bar. If the issue persists or if you suspect a gas or electrical fault, it is crucial to call a Gas Safe Engineer.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for resolving the F22 fault code is around £150 to £250, depending on whether the issue is simply re-pressurising the system or if it requires replacing components like a pressure relief valve.