Sta-Rite
Short Cycling
Heater cycles on and off frequently without reaching set temperature
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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
Oversized heater for pool volume, Faulty thermostat sensor, Poor water flow causing high limit trips, External automation misconfiguration
How to Fix / Troubleshooting
Safety: Turn off power before accessing sensors or control wiring.
- Check setpoint and differential: Ensure the temperature setpoint is reasonable and that the heater is not being turned on/off rapidly by automation.
- Verify flow and filter condition: Clean the filter and confirm adequate flow to prevent high limit trips.
- Inspect temperature sensor: Test the Sta-Rite water temperature sensor for correct resistance. Replace if readings are erratic.
- Review automation settings: If connected to a pool controller, verify that the heater is not being cycled by tight temperature bands or conflicting schedules.
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Repair Difficulty
Medium
3/5
Required Part
Water Temperature Sensor
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