What does the Ideal Logic Max F35 fault code mean?
The F35 fault code on the Ideal Logic Max indicates a low temperature limit fault, which typically means that the boiler is not reaching the required temperature for safe operation. This can lead to inefficient heating and potential system damage if not addressed promptly.
Common Causes
- Faulty Temperature Sensor: A malfunctioning temperature sensor may incorrectly read the water temperature, causing the boiler to shut down to prevent overheating.
- Blocked Heat Exchanger: A blockage in the heat exchanger can prevent proper heat transfer, leading to lower water temperatures and triggering the fault code.
Can I fix it myself? (DIY)
It is advisable to call a Gas Safe Engineer for this issue, as it may involve gas or electrical components that require professional handling. Attempting to fix these issues without proper training can be dangerous.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for addressing an F35 fault could range around £150 to £250, primarily depending on whether the temperature sensor needs replacement or if the heat exchanger requires cleaning or repair.