What does the Ideal Mini F45 fault code mean?
The F45 fault code on the Ideal Mini indicates a problem with the central heating thermistor, which is responsible for measuring the temperature of the water in the heating system. This fault can lead to inefficient heating or system shutdown if not addressed.
Common Causes
- Faulty Thermistor: The thermistor may be malfunctioning or damaged, leading to incorrect temperature readings.
- Wiring Issues: Damaged or loose wiring connections to the thermistor can cause communication failures between the thermistor and the boiler control board.
Can I fix it myself? (DIY)
It is recommended to call a Gas Safe Engineer to diagnose and repair this fault, as it involves electrical components and safety risks. Attempting to fix it yourself may void warranties or cause further issues.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for replacing a faulty thermistor in an Ideal Mini boiler is approximately £120 to £150. This includes the cost of the part and labour, reflecting the typical pricing for such repairs in the UK.