Low Compressor Suction Ratio (Scroll Only)

Suction pressure ratio below safe operating limits for the Scroll compressor.

Possible causes

Low refrigerant charge
Restriction in suction line
ETV valve incorrectly closed
Defective suction pressure sensor

Recommended actions

Verify refrigerant levels and possible leaks
Check suction line filters
Verify ETV parameters in the controller
Inspect suction pressure sensor and wiring

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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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