What does the Ideal Mexico HE F74 fault code mean?
The F74 fault code on the Ideal Mexico HE indicates a central heating (CH) safety fault, which typically suggests an issue with the boiler’s operation that could affect safety. This fault may arise from overheating or a malfunction in the temperature sensors or controls.
Common Causes
- Overheating: This can occur due to a blocked heat exchanger or insufficient water flow, leading to the boiler shutting down for safety.
- Faulty Temperature Sensors: If the temperature sensors are malfunctioning, they may incorrectly signal that the boiler is overheating, triggering the F74 fault code.
Can I fix it myself? (DIY)
It is strongly advised to call a Gas Safe Engineer for this issue, as it involves safety-critical components. Attempting to fix gas or electrical issues without proper training can be dangerous.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for addressing the F74 fault could be around £150 to £250, depending on whether the issue is a simple sensor replacement or requires more extensive repairs to the heat exchanger.