BWT
Overheating / Thermostat Overshoot
Heater runs but pool water becomes too hot and overshoots 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
Faulty water temperature sensor reading low, Sensor not in proper water flow, Control board calibration error, External control misconfiguration
How to Fix / Troubleshooting
Safety first: Turn off power before adjusting sensors.
- Verify setpoint: Confirm the desired temperature is correctly set on the BWT controller and any external thermostat.
- Check sensor placement: Ensure the water temperature sensor is installed in a location with representative flow, not in a stagnant or bypassed section.
- Compare temperatures: Use a reliable pool thermometer to compare actual water temperature with the heater’s display. Large discrepancies indicate sensor or calibration issues.
If the heater consistently overshoots, the water temperature sensor or control board may need replacement or recalibration by a technician.
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Repair Difficulty
Medium
3/5
Required Part
BWT Water Temperature NTC Sensor
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