C6
Ideal
Fan Speed / Air Pressure Sensing Issue
Ideal boiler shows C6 and may not modulate correctly
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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
Fan not reaching commanded speed, Blocked flue, Faulty fan speed sensor, PCB fan control fault
How to Fix / Troubleshooting
Safety first: Fan and flue are part of the combustion circuit. Only a Gas Safe engineer may work on them.
User checks:
- Check flue terminal: Ensure the external flue is not obstructed by debris, plants, or snow.
- Reset: Power cycle and reset the boiler once.
If C6 persists, an engineer must test the fan, check flue integrity, and verify PCB outputs.
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Repair Difficulty
Professional Required
5/5
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