What does the Ideal Mini F55 fault code mean?
The F55 fault code on the Ideal Mini boiler indicates a problem with the domestic hot water (DHW) temperature differential. This typically means that the temperature difference between the flow and return pipes is not within the expected range, which can affect the efficiency of hot water delivery.
Common Causes
- Faulty DHW Sensor: A malfunctioning sensor may not accurately measure the water temperature, leading to incorrect readings and triggering the fault code.
- Blocked Heat Exchanger: A blockage in the heat exchanger can restrict water flow, causing temperature differentials that exceed acceptable limits.
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 expertise. Attempting DIY repairs could be dangerous.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for resolving an F55 fault could range from £150 to £300, depending on whether the DHW sensor needs replacement or if the heat exchanger requires cleaning or repair. This cost reflects the complexity of the work and the need for professional service.