C4
Ideal
Flow Temperature Sensor Out of Range (CH)
Ideal boiler displays C4 and may not fire for central heating
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Flow NTC thermistor out of calibration, Poor sensor contact with pipe, Damaged sensor wiring, PCB sensor circuit fault
How to Fix / Troubleshooting
Safety first: Internal sensor access must be by a Gas Safe engineer.
User steps:
- Reset: Power cycle and reset the boiler once.
If C4 returns, an engineer should test and replace the flow NTC sensor and check wiring and PCB.
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Repair Difficulty
Hard
4/5
Required Part
Flow NTC Thermistor
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