What does the Ideal Mexico HE F77 fault code mean?
The F77 fault code on the Ideal Mexico HE indicates a domestic hot water (DHW) electrical fault. This typically points to an issue with the electrical components responsible for heating water, which may affect the boiler’s ability to provide hot water.
Common Causes
- Faulty DHW Sensor: A malfunctioning sensor can disrupt the electrical signals needed for proper operation.
- Wiring Issues: Damaged or loose wiring connections can lead to electrical faults, preventing the boiler from functioning correctly.
Can I fix it myself? (DIY)
It is recommended 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 F77 fault could be around £150 to £250, depending on whether the issue is a faulty sensor or wiring repairs. This estimate includes parts and labour for a qualified engineer to diagnose and fix the problem.