AO5
Jandy
Air Flow Fault – Blower Speed / Proving Timeout
Display shows AO5; heater may attempt to start but shuts down quickly.
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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
Weak blower motor, Restricted intake or exhaust, Faulty blower capacitor (if equipped), Control board speed sensing failure
How to Fix / Troubleshooting
Safety first: Turn off power and allow the heater to cool.
- Check for restrictions: Inspect intake and exhaust terminations for obstructions, insect screens clogged with debris, or improper clearances.
- Inspect blower: Remove debris from the blower wheel and housing. Ensure the wheel is not rubbing on the housing.
- Electrical checks: Verify blower wiring harness is secure. If the blower is noisy or slow to start, it may be failing and should be replaced.
- If AO5 persists: A technician should measure blower current draw and verify the control board is providing correct power. Replace the blower or board as indicated.
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Repair Difficulty
Hard
4/5
Required Part
Blower Motor Assembly
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