Defrost Damper Stuck Closed (Zone)

The evaporator damper has become stuck in the closed position.

Possible causes

Ice blocking mechanical movement
Broken return spring
Defective damper actuator

Recommended actions

Defrost the unit to remove obstructive ice
Visually inspect the closing mechanism
Repair or replace the damper actuator

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Other Thermo King codes

00No Alarms Exist 02Check Evaporator Coil Sensor (Zone)03Check (Control) Return Air Sensor (Zone)04Check (Control) Discharge Air Sensor (Zone)05Check Ambient Temp Sensor 06Check Coolant Temp Sensor

View all Thermo King codes

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