Wyze
Open Cooling Call Circuit
Thermostat calls for cooling but outdoor AC unit does not turn on; indoor blower may run.
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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
Loose Y1 wire at Wyze thermostat, Y wire disconnected at furnace or air handler, Broken Y conductor in thermostat cable, Float switch or safety device open in Y circuit
How to Fix / Troubleshooting
Safety first: Turn off power to both the furnace/air handler and outdoor condenser at the breaker.
- Inspect Y1 at thermostat: Remove the display and ensure the Y1 wire is fully seated in the Y1 terminal.
- Check Y at furnace/air handler: At the control board, confirm the same colored wire is attached to the Y terminal and that any inline float switches are not tripped (check condensate pan for water).
- Bypass float switch (temporary test only): If a condensate float switch is present, you may temporarily jumper around it to test if the AC starts. If it does, address the condensate drainage issue and reset or replace the float switch.
- Continuity test: With power off and Y disconnected at both ends, test continuity of the Y conductor. Replace the cable if open.
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Repair Difficulty
Hard
4/5
Required Part
Thermostat Cable (Y1 Conductor)
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