What does the Ideal Logic Max F85 fault code mean?
The F85 fault code on the Ideal Logic Max indicates a calibration issue with the domestic hot water (DHW) flow switch. This typically means that the boiler is unable to accurately detect the flow of hot water, which can affect its performance.
Common Causes
- Faulty Flow Switch: The flow switch may be malfunctioning or damaged, preventing proper calibration.
- Blocked Water Path: A blockage in the water path can disrupt the flow, leading to incorrect readings by the flow switch.
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 to fix it yourself may pose safety risks.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for resolving the F85 fault could be around £150 to £250, primarily depending on whether the flow switch needs replacement or if there are additional issues that require attention.