Heating Cycle Check (Zone)

The system detects insufficient heating capacity.

Possible causes

Three-way valve failure
Low refrigerant level
Hot gas solenoid issue

Recommended actions

Verify three-way valve operation
Check discharge pressure during heating mode
Inspect heat solenoid coils

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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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