What does the Ideal Mexico HE F78 fault code mean?
The F78 fault code on the Ideal Mexico HE indicates a central heating (CH) electrical fault, which typically points to issues with the boiler’s electrical components or wiring. This fault can prevent the boiler from operating correctly, affecting heating performance.
Common Causes
- Electrical Wiring Issue: Damaged or loose wiring connections can disrupt the electrical flow, leading to the F78 fault.
- Faulty PCB (Printed Circuit Board): A malfunctioning PCB can cause electrical faults, as it controls various functions of the boiler.
Can I fix it myself? (DIY)
It is strongly advised to call a Gas Safe Engineer for any electrical issues, as working with gas appliances can be dangerous. Attempting to fix electrical faults without proper training can lead to further damage or safety hazards.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for resolving the F78 fault could range from £150 to £300, depending on whether the issue is a simple wiring fix or requires a replacement PCB, which can be more expensive due to parts and labour.