What does the Ideal Logic Max F89 fault code mean?
The F89 fault code indicates a calibration mismatch with the domestic hot water (DHW) flow switch in the Ideal Logic Max boiler. This issue can prevent the boiler from properly detecting water flow, leading to inadequate hot water supply.
Common Causes
- Incorrect Flow Switch Calibration: The flow switch may not be calibrated correctly, causing it to misread the water flow.
- Faulty Flow Switch: The flow switch itself could be defective or damaged, leading to incorrect readings and triggering the fault code.
Can I fix it myself? (DIY)
It is recommended to call a Gas Safe Engineer to address this issue, as it involves gas and electrical components that require professional expertise for safety and compliance.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for resolving the F89 fault code is approximately £150 to £250. This includes the cost of a new flow switch and labour, as calibration issues often necessitate part replacement.