E13
Monarch
Temperature Sensor Error
E13 displayed and the unit reports a temperature sensor or over-temperature fault (on models with temperature monitoring)
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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 NTC temperature sensor on valve, Sensor wiring damaged or disconnected, Softener installed on hot feed instead of cold, Ambient temperature exceeding design limits
How to Fix / Troubleshooting
Safety first: Turn off power before inspecting sensors or wiring.
- Verify installation: Confirm the Monarch softener is installed on the cold water main only. Connection to a hot feed can trigger over-temperature errors and damage components.
- Check sensor location: Locate the temperature sensor on the valve body or inlet. Ensure it is firmly seated and not exposed to external heat sources (e.g., boiler flue, direct sunlight).
- Inspect wiring: Follow the sensor cable to the PCB and check for cuts, abrasions, or loose connectors.
- Allow to cool: If the unit is in a very hot cupboard, improve ventilation and allow the area to cool before resetting the error.
- Replace sensor if faulty: If resistance readings are out of specification (per Monarch data), replace the NTC sensor with the correct part.
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Repair Difficulty
Medium
3/5
Required Part
Temperature Sensor (NTC)
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