A11
IVT
Fan Motor / Fan Control Fault
Boiler displays A11, the fan does not start, no ignition attempt.
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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
failed fan motor, seized fan bearings, no power from PCB to fan, faulty fan speed feedback signal
How to Fix / Troubleshooting
Safety: Isolate the power before accessing the fan or PCB. Combustion components must be handled by a qualified engineer.
Technician steps:
- Check for a 230 V (or specified) supply to the fan when a heat demand is present.
- If a supply is present but the fan does not run, replace the fan assembly.
- If no supply is present, test the PCB fan relay or triac and control signals.
- Inspect the fan impeller for obstruction and ensure it spins freely.
- Verify the fan speed feedback (tachometer) signal to the PCB; replace the fan if feedback is missing or erratic.
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Repair Difficulty
Hard
4/5
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