Check Evaporator Coil Sensor (Zone)

The microprocessor has detected a failure or out-of-range reading in the evaporator coil sensor.

Possible causes

Defective coil sensor
Loose or corroded electrical connection
Damaged or cut sensor wires

Recommended actions

Measure sensor resistance with multimeter
Inspect wiring harness to the evaporator
Verify connections on the control board

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