E10
BWT
Hardness / Conductivity Sensor Fault
Display shows E10 and the unit indicates a resin capacity or hardness sensor issue
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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 BWT conductivity probe, Fouled sensor with iron or scale, Loose sensor wiring, Sensor installed in wrong orientation
How to Fix / Troubleshooting
Safety first: Turn off power and close water valves before removing any sensor from the water path.
- Locate sensor: Some advanced BWT softeners use a conductivity or hardness sensor on the outlet manifold. Identify it from the manual.
- Clean sensor tip: Remove the sensor and gently clean the probe surfaces with a soft brush and mild descaling solution. Rinse thoroughly with clean water.
- Check orientation: Ensure the sensor is reinstalled in the correct flow direction and fully seated with its O-ring intact to prevent leaks.
- Verify wiring: Confirm the sensor cable is intact and firmly connected to the control board.
- Recalibrate if required: Follow BWT instructions to recalibrate or reset the hardness sensor after cleaning.
If E10 persists, replace the BWT hardness/conductivity sensor. Continued issues may indicate a control board fault.
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Repair Difficulty
Hard
4/5
Required Part
BWT hardness/conductivity sensor
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