What does the Glow-worm Energy F64 fault code mean?
The F64 fault code on a Glow-worm Energy boiler indicates a fault with the central heating (CH) thermostat. This typically means that the thermostat is not communicating properly with the boiler, which can prevent the heating system from functioning correctly.
Common Causes
- Faulty Thermostat: The thermostat may be malfunctioning or damaged, leading to incorrect temperature readings.
- Wiring Issues: Loose or damaged wiring connections between the thermostat and the boiler can disrupt communication.
Can I fix it myself? (DIY)
If you are comfortable with basic electrical work, you can check the thermostat settings and wiring connections. However, for any gas or electrical issues, it is strongly advised to call a qualified Gas Safe Engineer to ensure safety and compliance with regulations.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for resolving an F64 fault code is around £150 to £250. This includes potential replacement of the thermostat and any necessary wiring repairs, reflecting the typical labour and parts costs in the UK.