iComfort
Outdoor Sensor Detection Failure
Thermostat fails to detect outdoor temperature even though an outdoor sensor is installed
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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
Outdoor sensor wired to wrong terminals, Open circuit in sensor wiring, Incompatible sensor type, Outdoor sensor feature disabled in setup
How to Fix / Troubleshooting
Safety first: Turn off power to the HVAC system before working on sensor wiring.
- Step 1 – Enable sensor in setup: In installer settings, ensure that the external outdoor sensor option is enabled.
- Step 2 – Verify wiring: Confirm that the outdoor sensor wires are connected to the correct sensor terminals on the thermostat or interface module.
- Step 3 – Check continuity: With power off, disconnect the sensor and measure resistance across the sensor leads. Infinite resistance indicates a broken wire or failed sensor.
- Step 4 – Replace sensor: If the sensor is open or out of specification, install a new iComfort‑compatible outdoor sensor.
- Step 5 – Confirm reading: Restore power and verify that the thermostat now displays a reasonable outdoor temperature.
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Repair Difficulty
Medium
3/5
Required Part
iComfort Outdoor Temperature Sensor
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