Aquacomfort Overheating / Runaway Temperature

Heater runs but spa overheats well beyond the set temperature.

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

Stuck gas valve, Shorted temperature sensor, Miswired external thermostat, Control board failure

Danger: Overheating can scald users and damage equipment. Turn off gas and power immediately.

Verify setpoint: Confirm that the thermostat is not set excessively high and that any external automation is not overriding the setpoint.
Check sensor reading: Compare displayed temperature to an accurate thermometer. If the display is much lower than actual, the sensor or board is faulty.
Do not operate: Do not use the heater again until a qualified technician has inspected the gas valve and controls.

Professional Required 5/5

Water Temperature Sensor

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