Heating Cycle Fault (Zone)

Critical failure preventing the unit from generating heat when required.

Possible causes

Three-way valve stuck in cool mode
Burned heat solenoid pilot
Massive refrigerant leak

Recommended actions

Test manual actuation of the three-way valve
Verify electrical signal from microprocessor to solenoids
Check gas charge

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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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