What does the Glow-worm Ultimate F93 fault code mean?
The F93 fault code on the Glow-worm Ultimate indicates a domestic hot water (DHW) electrical alert, which suggests there is an issue with the electrical components related to the hot water system. This could involve a fault in the wiring, a malfunctioning sensor, or a problem with the control board.
Common Causes
- Faulty DHW Sensor: A malfunctioning sensor can fail to detect the temperature correctly, triggering the fault code.
- Electrical Wiring Issues: Damaged or loose wiring connections can disrupt the electrical flow, leading to the F93 alert.
Can I fix it myself? (DIY)
It is strongly advised to call a Gas Safe Engineer for this issue, as it involves electrical components that can be dangerous if handled improperly. Attempting DIY repairs on gas or electrical systems can pose serious safety risks.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for resolving the F93 fault could range from £150 to £300, depending on whether the issue is a simple wiring fix or requires replacement of the DHW sensor or control board. This estimate includes parts and labour.