What does the Ideal Mexico HE F89 fault code mean?
The F89 fault code on the Ideal Mexico HE indicates a domestic hot water (DHW) calibration fault. This typically means that the boiler is unable to properly regulate the temperature of the hot water being supplied.
Common Causes
- Faulty DHW Sensor: A malfunctioning sensor may fail to accurately measure the water temperature, leading to calibration issues.
- Control Board Issues: Problems with the control board can disrupt the communication between components, affecting DHW calibration.
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 handling for safety reasons.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for resolving the F89 fault could be around £150 to £250, primarily depending on whether the DHW sensor or control board needs replacement, which are both critical components.