What does the Glow-worm Energy F73 fault code mean?
The F73 fault code indicates a problem with the domestic hot water (DHW) supply temperature, suggesting that the boiler is unable to heat the water to the required temperature. This can lead to insufficient hot water for taps and showers.
Common Causes
- Faulty DHW Sensor: The sensor may be malfunctioning, causing incorrect temperature readings and triggering the fault code.
- Blocked Heat Exchanger: A blockage in the heat exchanger can prevent efficient heat transfer, leading to inadequate hot water supply.
Can I fix it myself? (DIY)
It is recommended to call a Gas Safe Engineer for this issue, as it involves gas and electrical components that require professional expertise. Attempting DIY repairs could be dangerous.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for resolving the F73 fault could be around £150 to £250, primarily depending on whether the DHW sensor needs replacement or if the heat exchanger requires cleaning or repair.