What does the Ideal Logic Max F99 fault code mean?
The F99 fault code indicates a calibration issue with the domestic hot water (DHW) temperature sensor in the Ideal Logic Max boiler. This fault can prevent the boiler from accurately regulating water temperature, potentially leading to inconsistent hot water supply.
Common Causes
- Faulty DHW Temperature Sensor: The sensor may be malfunctioning or damaged, leading to incorrect readings.
- Wiring Issues: Damaged or loose wiring connections to the temperature sensor can disrupt its functionality.
Can I fix it myself? (DIY)
It is recommended to call a Gas Safe Engineer for this issue, as it involves electrical components and safety risks. Attempting to fix it yourself could lead to further damage or safety hazards.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for replacing the DHW temperature sensor is around £150-£200. This includes the cost of the part and labour, reflecting the complexity of the repair and the need for a qualified technician.