Heater Fan Failure (CR)

Fault detected in the heater fan motor or circuit.

Possible causes

Burnt fan motor
Blown heater control fuse
Mechanical obstruction in fan blades
Defective control relay

Recommended actions

Check for voltage at the fan motor
Inspect and replace fuses if necessary
Manually rotate fan to rule out blockages
Test heat relay operation

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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

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