What does the Glow-worm Energy F56 fault code mean?
The F56 fault code indicates a problem with the central heating (CH) flow switch, which is responsible for detecting the flow of water through the heating system. When this fault occurs, the boiler may not operate correctly, leading to heating issues.
Common Causes
- Blocked Flow Switch: Debris or limescale buildup can obstruct the flow switch, preventing it from functioning properly.
- Faulty Flow Switch: The flow switch itself may be defective or worn out, requiring replacement to restore normal operation.
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 to handle without proper training. Attempting DIY repairs could void your warranty or lead to safety hazards.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for a faulty flow switch on a Glow-worm Energy boiler is around £150 to £250, which includes the cost of the part and labour. This estimate reflects the typical price for a replacement flow switch and the associated service charge for a qualified engineer.