AO
Jacuzzi
Airflow / Blower Overrun Fault
Jacuzzi pool heater shows AO; blower may run continuously even when there is no call for heat.
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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
Stuck blower relay on control board, Faulty blower proving switch, Control board logic fault, Miswired blower motor
How to Fix / Troubleshooting
Safety first: Turn off power before inspecting internal components.
Steps to troubleshoot AO:
- Observe blower behavior: Note whether the blower runs as soon as power is applied, regardless of thermostat demand. This suggests a stuck relay or wiring issue.
- Inspect wiring: Verify that the blower motor leads are connected to the correct terminals on the Jacuzzi control board and that no wires are shorted.
- Check air pressure switch: A stuck-closed air pressure switch can confuse the control. Test the switch with a multimeter; it should be open with the blower off.
- Control board replacement: If the blower relay is welded closed or the board continues to power the blower incorrectly, replace the main control board.
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Repair Difficulty
Hard
4/5
Required Part
Jacuzzi Combustion Blower Motor
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