What does the Glow-worm Ultimate F34 fault code mean?
The F34 fault code indicates a low temperature limit fault in the Glow-worm Ultimate boiler. This typically means that the boiler is unable to maintain the required water temperature, which can affect heating efficiency.
Common Causes
- Faulty Temperature Sensor: A malfunctioning temperature sensor may not accurately read the water temperature, leading to the F34 error.
- Blocked Heat Exchanger: A blockage in the heat exchanger can prevent proper heat transfer, causing the boiler to register low temperatures.
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 require professional handling. Attempting DIY repairs could be dangerous.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for resolving an F34 fault may range around £150 to £250, primarily depending on whether the temperature sensor needs replacement or if the heat exchanger requires cleaning or servicing.