Source-backed catalogue
Verified boiler fault-code guides
Choose a supported model and code to read the catalogue entry and its source documents.
Ideal · Exclusive 2
- Ideal F1F1 indicates low water pressure.
- Ideal F4F4 indicates a flow thermistor fault.
- Ideal F5F5 indicates a return thermistor fault.
- Ideal F6F6 indicates outside sensor failure.
- Ideal F7F7 indicates low mains voltage.
- Ideal F9F9 indicates an unconfigured or faulty PCB.
- Ideal L1L1 indicates flow temperature overheat or no water flow.
- Ideal LCLC indicates 5 boiler resets in 15 minutes.
- Ideal FHFH indicates no primary water flow.
- Ideal FLFL indicates pump dry run.
- Ideal FPFP indicates pump rotor blocked.
- Ideal FANegative Differential Flow/Return Thermistor.
- Ideal FUFlow/Return Differential > 50°C.
- Ideal UDiverter Valve in mid-position for service.
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