What does the Ideal Logic Plus F79 fault code mean?
The F79 fault code on the Ideal Logic Plus indicates a problem with the boiler’s energy optimization feature, which is responsible for improving efficiency and performance. This fault typically suggests that the boiler is unable to correctly assess or adjust its operation based on the heating demand.
Common Causes
- Faulty PCB: A malfunctioning printed circuit board (PCB) can disrupt communication between components, leading to energy optimization issues.
- Sensor Issues: Defective temperature or pressure sensors may provide incorrect readings, preventing the boiler from optimizing its performance.
Can I fix it myself? (DIY)
It is recommended to call a Gas Safe Engineer for this issue, as it involves complex electrical and gas components that require professional expertise to ensure safety and compliance with regulations.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for resolving an F79 fault is around £200 to £300, primarily due to the potential need for a new PCB or sensor replacement, which can be costly in terms of parts and labour.