AO3
Jandy
Air Flow Fault – Blower Proving Error
Display shows AO3; heater locks out and blower behavior is abnormal.
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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 blower motor, Loose blower harness, Blocked blower wheel, Faulty control board blower output
How to Fix / Troubleshooting
Safety first: Turn off power at the breaker. Do not reach into the blower with power connected.
- Inspect blower wheel: Remove the front panel and visually inspect the blower wheel for debris, rust, or broken fins. Spin it by hand to ensure it moves freely.
- Check wiring: Verify the blower motor plug is fully seated on the control board and that no wires are burned or pinched.
- Listen for operation: Restore power and command heat. If the blower hums but does not start, the motor may be seized or failing and should be replaced.
- If AO3 persists with a good blower: The control board may not be energizing the blower correctly. A technician should test voltage to the blower and replace the board if defective.
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Repair Difficulty
Hard
4/5
Required Part
Blower Motor Assembly
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