Unit Forced to Low Speed Modulation

The unit is forced to low speed due to a limitation in the modulation system.

Possible causes

Modulation valve failure
Low suction pressure protection
Software or configuration error
Incorrect refrigerant charge

Recommended actions

Verify modulation valve operation
Check operating pressures
Inspect evaporator temperature sensors
Restart the microprocessor

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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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