What does the Glow-worm Energy F81 fault code mean?
The F81 fault code indicates a problem with the domestic hot water (DHW) pressure relief valve in the Glow-worm Energy boiler. This fault may prevent the boiler from supplying hot water effectively and could lead to safety issues if not addressed.
Common Causes
- Faulty Pressure Relief Valve: The valve may be stuck or malfunctioning, causing it to not open or close properly.
- Excessive Pressure: High water pressure in the system can trigger the relief valve, leading to a fault code.
Can I fix it myself? (DIY)
It is recommended to call a Gas Safe Engineer to diagnose and repair this issue, as it involves gas and water systems that can be dangerous if handled improperly.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for fixing the F81 fault is around £150 to £250, which includes the replacement of the pressure relief valve and associated labour costs. This estimate reflects the specific parts and expertise required for the repair.