Harris
Intermittent Power / Control Instability
Pump turns on and off rapidly (short cycling) without user input
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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
Loose line connections, Failing breaker, Control PCB power supply issues, External automation sending erratic commands
How to Fix / Troubleshooting
Safety first: Turn off power and secure the breaker before inspecting wiring.
- Check line connections: Tighten all line and neutral connections at the Harris pump terminal block and at the breaker panel (by a qualified person).
- Test without automation: Disconnect any external control wiring and observe if the pump runs steadily under local control.
- Monitor voltage: Use a multimeter to watch line voltage at the pump while it cycles. Significant drops or interruptions indicate a supply issue.
If power is stable but cycling continues, the control module may be defective and should be replaced.
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Repair Difficulty
Hard
4/5
Required Part
Harris pump control module
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