What does the Glow-worm Energy F75 fault code mean?
The F75 fault code on a Glow-worm Energy boiler indicates a problem with the domestic hot water (DHW) mixing valve. This fault typically arises when the valve is stuck or not functioning correctly, leading to issues with hot water delivery.
Common Causes
- Stuck Mixing Valve: The valve may be physically stuck due to mineral build-up or mechanical failure, preventing it from adjusting the water temperature properly.
- Electrical Fault: There could be an issue with the wiring or connections to the mixing valve, causing it to fail to operate as intended.
Can I fix it myself? (DIY)
It is highly recommended to call a Gas Safe Engineer for this issue, as working with gas appliances can be dangerous. Attempting to fix electrical or gas-related faults without proper training can lead to serious safety risks.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for addressing the F75 fault, including parts and labour, is approximately £200-£300. This estimate accounts for the replacement of the mixing valve and any necessary electrical repairs.