What does the Glow-worm Betacom F59 fault code mean?
The F59 fault code on the Glow-worm Betacom indicates a problem with the domestic hot water (DHW) return temperature. This typically suggests that the temperature of the water returning to the boiler is outside the expected range, which can affect the efficiency of the heating system.
Common Causes
- Blocked Heat Exchanger: A blockage in the heat exchanger can prevent proper water flow, leading to incorrect temperature readings.
- Faulty Temperature Sensor: If the temperature sensor is malfunctioning, it may not accurately detect the return temperature, triggering the fault code.
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 addressing the F59 fault could range from £150 to £300, depending on whether the issue is a blocked heat exchanger or a faulty temperature sensor. This includes parts and labour for a qualified engineer to diagnose and resolve the problem.