Schneider Electric
Occupancy Input or Sensor Integration Failure
Thermostat does not respond to occupancy sensor or presence detection; stays in one mode.
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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
External occupancy sensor not wired correctly, Input type misconfigured, Sensor not powered, Faulty digital input on thermostat
How to Fix / Troubleshooting
Safety: Turn off low-voltage power before modifying sensor wiring.
Steps:
- Identify the occupancy input terminals on the thermostat and verify wiring to the Schneider Electric or third-party occupancy sensor.
- Confirm that the sensor has the required power supply (e.g., 24 VDC) and that it is functioning (LED indicators, test mode).
- In the thermostat configuration, set the input type to match the sensor (dry contact, active high/low, NO/NC).
- Test the sensor by manually triggering occupancy and observing the input status on the thermostat diagnostics screen (if available).
- If the sensor works but the thermostat does not change mode, the digital input circuit or firmware logic may be faulty; replace or update the thermostat.
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Repair Difficulty
Medium
3/5
Required Part
Digital Input Circuit / External Occupancy Sensor
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