ERR TEMP
Pentair
Temperature Sensor Fault / Overtemperature
Display shows ERR TEMP or HIGH TEMP; unit may suspend regeneration to protect components.
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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
Failed Pentair temperature sensor, Sensor located near hot water source, Control board misreading sensor, Loose sensor connection
How to Fix / Troubleshooting
Safety: Disconnect power before accessing internal sensors. Do not run hot water through a softener designed for cold water only.
- Check plumbing: Verify the softener is installed on the cold water line only and that there is no cross-connection allowing hot water into the inlet.
- Inspect sensor: Locate the temperature sensor on the valve or plumbing. Ensure it is firmly attached and not touching a hot surface (e.g., water heater flue).
- Wiring check: Reseat the sensor connector on the control board. Look for damaged insulation or corrosion.
- Sensor test: Measure sensor resistance at room temperature and compare to Pentair specifications. A reading far out of range indicates a bad sensor.
- Replace sensor: Install a new Pentair temperature sensor if defective. If a new sensor still causes ERR TEMP, the control board may need replacement.
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Repair Difficulty
Medium
3/5
Required Part
Pentair temperature sensor
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