Wyze
Accessory Control Circuit Fault
Thermostat fails to turn on humidifier or dehumidifier connected to accessory terminals.
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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
Accessory not wired to correct Wyze terminals, Accessory control disabled in Wyze app, Incorrect accessory type selected (humidify vs dehumidify), Open accessory control conductor
How to Fix / Troubleshooting
Safety first: Turn off power to the furnace/air handler at the breaker before working on accessory wiring.
- Verify wiring: Confirm the humidifier or dehumidifier control wires are connected to the correct accessory terminals on the Wyze thermostat or furnace control board as per Wyze’s wiring diagram.
- Enable accessory in app: In the Wyze app, ensure the accessory (humidifier or dehumidifier) is enabled and configured with appropriate setpoints.
- Check accessory power: Verify that the humidifier/dehumidifier has its required power source and any inline fuses or switches are on.
- Continuity test: With power off, test continuity of the accessory control wires between thermostat and equipment. Repair or replace if open.
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Repair Difficulty
Medium
3/5
Required Part
Thermostat Cable (Accessory Conductors)
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