What does the Glow-worm Energy F59 fault code mean?
The F59 fault code on the Glow-worm Energy boiler indicates a fault with the domestic hot water (DHW) valve. This issue typically prevents the boiler from supplying hot water effectively.
Common Causes
- Faulty DHW Valve: The valve may be stuck or malfunctioning, preventing proper operation.
- Electrical Connection Issues: Loose or damaged wiring can disrupt the signal to the valve, causing it to fail.
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 can be dangerous if handled improperly.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for fixing the DHW valve on a Glow-worm Energy boiler is around £250. This includes parts and labour, as the valve itself can be expensive and requires professional installation.