HI
Jacuzzi
High Water Temperature / Overheat
Jacuzzi pool heater display shows HI and shuts down; water may feel very hot at the outlet.
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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
Stuck or shorted temperature sensor, Poor water flow through heater, Mis-calibrated thermostat, Control board fault
How to Fix / Troubleshooting
Safety first: Turn off power and allow water to cool if the heater has overheated.
Steps to correct HI:
- Check water flow: Ensure the pump is running properly and that the filter is clean. Verify that valves are not throttling flow through the Jacuzzi heater.
- Compare displayed vs actual temperature: If the display shows a much higher temperature than a separate thermometer, the sensor or control is likely faulty.
- Inspect and test sensor: Check the water temperature sensor for proper installation and test its resistance. Replace if out of specification.
- Thermostat setting: Confirm the set temperature is reasonable (e.g., 78–104°F depending on pool/spa). Lower the setpoint and see if HI recurs.
Persistent HI errors after sensor replacement warrant professional evaluation of the control board and hydraulic design.
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Repair Difficulty
Medium
3/5
Required Part
Jacuzzi Water Temperature Sensor
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