12 FLASHES
York
Blower Calibration / Blower Fault (ECM models)
York furnace shows 12 flashes and may not respond to thermostat calls.
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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
ECM blower motor communication error, Loose blower harness, Faulty blower motor module, Control board configuration error
How to Fix / Troubleshooting
Safety: Disconnect power before working on the blower assembly. ECM motors store energy; wait a few minutes after power off.
- Access blower: Remove the blower compartment door. Locate the ECM blower motor and its multi-pin harness.
- Check connections: Ensure the low-voltage and high-voltage plugs are fully seated on the motor and control board. Look for corrosion or bent pins.
- Inspect for obstruction: Spin the blower wheel by hand; it should turn freely without scraping. Remove any debris.
- Reset control: Restore power and call for heat. Some York models will attempt to recalibrate the blower. Observe if the motor starts smoothly.
- Professional service: ECM motor and module diagnostics require specialized tools. If the 12-flash persists, a technician may need to replace the ECM motor or board.
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Repair Difficulty
Professional Required
5/5
Required Part
ECM Blower Motor
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