Sensor Error
Honeywell Home
Remote Room Sensor Communication or Circuit Fault
Thermostat or app reports 'Sensor Error' for a remote room 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
Disconnected Honeywell remote sensor, Broken sensor wiring, Dead battery in wireless sensor, Sensor out of range
How to Fix / Troubleshooting
Safety: For wired sensors, turn off HVAC power before handling wiring.
- Identify sensor type: Determine if the remote sensor is wired (e.g., Honeywell C7189) or wireless (e.g., Honeywell Home room sensor).
- For wired sensors: Check connections at the thermostat sensor terminals and at the sensor. Repair any broken wires and tighten terminals. Test resistance against Honeywell’s chart.
- For wireless sensors: Replace the sensor batteries with fresh alkaline cells. Ensure the sensor is within the recommended distance and not blocked by metal objects.
- Re‑pair wireless sensor: Use the thermostat or app to remove and then re‑add the sensor. Follow on‑screen prompts to complete pairing.
- Replace faulty sensor: If the error persists after wiring/battery checks, replace the remote sensor with a compatible Honeywell Home model.
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Repair Difficulty
Medium
3/5
Required Part
Honeywell Home Remote Room Sensor
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