What does the Glow-worm Ultimate F60 fault code mean?
The F60 fault code on the Glow-worm Ultimate indicates a malfunction with the domestic hot water (DHW) thermistor. This component is responsible for measuring the temperature of the water, and a fault can disrupt the boiler’s ability to provide hot water.
Common Causes
- Faulty DHW Thermistor: The thermistor may be damaged or malfunctioning, leading to incorrect temperature readings.
- Wiring Issues: Damaged or loose wiring connections to the thermistor can cause communication failures between the thermistor and the boiler’s control board.
Can I fix it myself? (DIY)
While you can check for loose connections, it is strongly advised to call a Gas Safe Engineer for any repairs involving gas or electrical components to ensure safety and compliance with regulations.
Estimated Repair Cost (2026 UK Prices)
The estimated cost for replacing a DHW thermistor on a Glow-worm Ultimate is around £120. This includes the part and labour, as the thermistor itself typically costs about £30, with the remainder covering the engineer’s time.