What does the Ideal Mexico HE F81 fault code mean?
The F81 fault code on the Ideal Mexico HE indicates a problem with the domestic hot water (DHW) operation. This typically suggests that the boiler is unable to heat water for taps or showers, which may be due to a malfunctioning component or sensor.
Common Causes
- Faulty DHW Sensor: The sensor that monitors the temperature of the hot water may be defective, preventing the boiler from functioning correctly.
- Blocked Heat Exchanger: A blockage in the heat exchanger can restrict water flow, leading to insufficient heating for domestic hot water.
Can I fix it myself? (DIY)
It is recommended to call a Gas Safe Engineer for this issue, as it involves gas and electrical components that require professional expertise. Attempting to fix it yourself could pose safety risks.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for resolving the F81 fault could be around £150 to £250, depending on whether the DHW sensor needs replacement or if the heat exchanger requires cleaning. This cost reflects the price of parts and the labour involved in the repair.