AF
Peerless
Combustion Air / Fan Speed Fault
Boiler displays AF and will not fire; may indicate 'Air Flow Fault'
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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
Blocked intake, incorrect fan speed feedback, damaged fan speed sensor, wiring fault
How to Fix / Troubleshooting
Safety first: Turn off power and gas. Do not operate with intake disconnected.
Steps:
- Inspect air intake: Check the intake pipe and termination for obstructions.
- Check fan speed sensor: On some Peerless models, the inducer has a Hall-effect or tach sensor. Inspect the connector and wiring.
- Clean fan wheel: Remove dust and debris from the inducer wheel that could affect speed.
- If AF persists: A technician should verify fan RPM via diagnostics and replace the inducer or control if needed.
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Repair Difficulty
Hard
4/5
Required Part
Inducer fan assembly
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