Pump runs intermittently, stopping and starting on its own without timer changes.

How to Fix / Troubleshooting

Safety: Isolate power before inspection.

Ventilation: Ensure the Onga motor is not obstructed and that ambient temperature is within spec.
Check connections: Tighten all terminal screws in the motor box and any junction boxes feeding the pump.
Inspect capacitor: Replace a suspect capacitor, as intermittent failure can cause cycling.
Monitor current draw: Have an electrician measure running current; high current indicates overload or mechanical drag.

If cycling continues, the motor's internal thermal protector may be failing and the motor should be replaced.