Panasonic OCU-CR200VF5 Service Manual page 28

Troubleshooting for Each Error Code
E 3 2
Indication
Probable
Suction gas superheat of 1 K or below continued for 2 minutes or longer.
Cause
Check the degree of suction gas superheat, and check if refrigerant flood back is occurring.
Check [ Suction gas superheat = Suction gas temperature - Evaporating temperature (Low
pressure conversion value) ]
Corrective
Adjust the cooling unit (Evaporator) side for maintaining suction gas superheat of 10 K or over,
and no frost remaining in the cooling unit (Evaporator).
Action
E 5 7
Indication
1. Refrigeration unit outlet temperature sensor connector (2P4) disconnected or contact
failure
Probable
2. Refrigerating unit outlet temperature sensor failure
Cause
3. Control PCB (CS1-PCB) failed
1. Check if the connector (2P4) on the CS1-PCB is disconnected or loose.
2. Check the resistance value of the refrigeration unit outlet temperature sensor, and check if
Check
the sensor and wiring is open or shorted.
[Method of checking]
Refer to "Method of Checking Sensor Characteristics" in the section "Failure Diagnosis".
1. Correct the attachment of the connector (2P4) on the CS1-PCB.
Corrective
2. Replace the refrigeration unit outlet temperature sensor.
Action
3. Replace the control PCB (the CS1-PCB).
Detected
Refrigerant flood back alarm
Content
Detected Refrigeration unit outlet temperature sensor
Content anomaly
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