Sta-Rite Overheating/Thermostat Overshoot

The heater runs but the pool temperature overshoots the setpoint significantly.

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.

Possible Causes

Misplaced temperature sensor, stuck relay on the control board, incorrect sensor type installed, external automation miscalibration.

Safety: Turn off power before adjusting sensors or control wiring.

Verify setpoint: Confirm the heater's set temperature and compare it with an independent thermometer in the pool or spa.
Check sensor location: Ensure the Sta-Rite water temperature sensor is properly installed in the manifold and not influenced by localized hot water.
Inspect control board relays: If the heater continues firing after reaching the setpoint, the gas valve relay on the board may be stuck. Replace the main control board.
Review automation calibration: If controlled by an external system, recalibrate temperature sensors and setpoints in the automation controller.

Hard 4/5

Main Control Board

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