York
Stuck Relay or Thermostat Control Fault
York AC runs continuously and will not shut off even when setpoint is reached
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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
Thermostat stuck calling for cooling, Short between R and Y, Stuck contactor, Faulty control board relay
How to Fix / Troubleshooting
Safety: Turn off power at the breaker if the unit will not shut off normally.
- Check thermostat: Remove the thermostat from its sub‑base. If the outdoor unit stops, the thermostat may be faulty and should be replaced.
- Inspect wiring: Look for a short between R and Y at the thermostat cable or control board.
- Check contactor: With power off, inspect the contactor. If the contacts are welded closed, replace the contactor.
- Board relay: If the indoor blower runs constantly in COOL mode only, the control board relay may be stuck and require board replacement.
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Repair Difficulty
Medium
3/5
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