E16
Schneider Electric Digital Input / Contact Fault

Thermostat shows E16 and indicates external input fault (e.g., window contact, occupancy sensor).

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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

Broken wire to window/door contact, Stuck or shorted external contact, Incorrect input type configuration (NO vs NC), Faulty digital input circuit on thermostat

How to Fix / Troubleshooting

Safety: Turn off low-voltage power before modifying input wiring.

Steps:

  • Identify the external input terminals on the thermostat (e.g., DI, IN1/IN2) and trace the cable to the connected device (window contact, occupancy sensor, keycard switch).
  • Check that the contact device operates mechanically (clicks when opened/closed) and that its wires are intact.
  • Use a multimeter to verify that the contact opens and closes properly. Repair or replace the contact if it is stuck.
  • In the thermostat configuration, ensure the input type (normally open or normally closed) matches the actual device.
  • If wiring and device are good but E16 persists, the thermostat's digital input circuit may be damaged; replace the thermostat.
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Repair Difficulty

Medium 3/5

Required Part

Digital Input Circuit / External Contact Device
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