What does the Glow-worm Ultimate F57 fault code mean?
The F57 fault code on the Glow-worm Ultimate indicates a domestic hot water (DHW) electrical failure. This typically suggests an issue with the electrical components responsible for heating water, which may affect the boiler’s ability to provide hot water.
Common Causes
- Faulty DHW Sensor: A malfunctioning sensor can disrupt the electrical signals needed for proper operation.
- Wiring Issues: Damaged or loose wiring connections can lead to electrical failures, preventing the boiler from functioning correctly.
Can I fix it myself? (DIY)
It is strongly advised to call a Gas Safe Engineer for any electrical issues related to the boiler. Attempting to fix electrical components without proper training can be dangerous.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for resolving the F57 fault could range from £150 to £300, depending on whether the issue is a simple wiring repair or requires replacement of the DHW sensor, which can be more expensive.