E03
Schneider Electric
Floor Sensor Failure (Hydronic or Electric Floor Heating)
E03 displayed and thermostat cannot control floor heating accurately; floor temperature reading is missing or incorrect.
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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 Schneider Electric floor probe sensor, Damaged floor sensor cable in conduit, Loose floor sensor terminal screws on thermostat backplate, Incorrect sensor type configured in thermostat settings
How to Fix / Troubleshooting
Safety: Switch off power to the heating circuit and thermostat at the breaker.
Steps:
- Remove the thermostat from the wall and locate the floor sensor terminals (often labeled FS, F1/F2, or similar).
- Ensure the sensor wires are firmly clamped under the terminal screws and not broken or frayed.
- Disconnect the sensor wires and measure resistance with a multimeter. Compare to the Schneider Electric floor sensor specification (e.g., 10kΩ NTC at 25°C). A reading far outside the expected range indicates a failed sensor.
- If the sensor is open or shorted, replace it with a compatible Schneider Electric floor sensor. If the sensor is embedded in the floor, you may be able to pull a new sensor through the existing conduit; otherwise, consult a professional.
- Enter the thermostat installer menu and verify that the correct sensor type (floor, room, or combined) is selected according to the installation manual.
- Restore power and confirm that E03 clears and floor temperature is displayed correctly.
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Repair Difficulty
Hard
4/5
Required Part
Schneider Electric Floor Temperature Sensor
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