What does the Ideal Mini F77 fault code mean?
The F77 fault code on the Ideal Mini indicates a problem with the domestic hot water (DHW) system flow rate. This typically means that the boiler is not detecting sufficient water flow, which can affect hot water delivery.
Common Causes
- Blocked Filter: A blockage in the DHW filter can restrict water flow, leading to the F77 fault code.
- Faulty Flow Sensor: A malfunctioning flow sensor may fail to detect the water flow accurately, triggering the fault code.
Can I fix it myself? (DIY)
If you are comfortable with basic maintenance, check and clean the DHW filter. However, for issues related to the flow sensor or any gas/electrical components, it is crucial to call a Gas Safe Engineer for safety reasons.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for addressing the F77 fault code is around £150 to £250. This includes potential cleaning of the filter and replacement of the flow sensor, which are common issues associated with this fault.