What does the Ideal Mini F33 fault code mean?
The F33 fault code on the Ideal Mini indicates a high temperature limit fault, which means the boiler has detected that the water temperature has exceeded safe operating limits. This safety feature prevents overheating and potential damage to the system.
Common Causes
- Blocked Heat Exchanger: A build-up of debris or limescale can restrict water flow, causing the temperature to rise excessively.
- Faulty Thermostat: If the thermostat is malfunctioning, it may not accurately read the water temperature, leading to overheating.
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 can be dangerous if handled improperly. Attempting to fix it yourself could void any warranties and pose safety risks.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for resolving an F33 fault could range around £150 to £250, primarily depending on whether the heat exchanger needs cleaning or replacement, or if the thermostat requires servicing.