USSPA
Temperature Regulation / Calibration Issue
Water temperature fluctuates widely or does not match the 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
Aging or misreading temperature sensor, Poor sensor contact with heater tube, Control board calibration drift, Strong external temperature influences on sensor location
How to Fix / Troubleshooting
Safety first: Turn OFF power before adjusting or replacing sensors.
- Verify with external thermometer:
- Compare displayed temperature with an accurate thermometer in the spa water.
- Inspect sensor mounting:
- Ensure the sensor is firmly attached to the heater tube or fully seated in its well.
- Replace sensor if inaccurate:
- If readings are consistently off by more than a few degrees, install a new USSPA temperature sensor.
- Control board replacement:
- If a new sensor does not resolve the issue, the control board's temperature circuit may be faulty and require replacement.
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Repair Difficulty
Medium
3/5
Required Part
Water Temperature Sensor
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