Panasonic OCU-CR200VF5 Service Manual page 27

Troubleshooting for Each Error Code
E 2 8
Indication
Probable
Gas cooler fan motor anomaly (E27) occurred 10 times.
Cause
Check Refer to E27.
Corrective
Refer to E27.
Action
E 3 1
Indication
Probable
High pressure went up to 11.7 MPa.
Cause
1. Investigate the cause of high pressure going up to 11.7 MPa.
(1) Split cycle electronic expansion valve (MOV3) or Adjusting refrigerant amount
[Method of checking]
Refer to "Method of Checking Coil Resistance of Electronic Expansion Valve" in the
section "Failure Diagnosis".
(2) Gas cooler fan motor anomaly (E27 or E28 generated)
(3) Refrigerant overcharge, etc.
Check
2. Check the output voltage of the high pressure sensor, and check if the sensor and wire is
open.
[Method of checking]
Refer to "Method of Checking Sensor Characteristics" in the section "Failure Diagnosis".
3. Check if the high pressure sensor connector (3P3) on the CS1-PCB or the pressure
sensor side connector is disconnected or loose.
1. Check the attachment condition of the electronic expansion valve (MOV3, MOV4) along
with its coil. In case of anomaly, replace the expansion valve (MOV3, MOV4).
2. When the gas cooler fan motor anomaly (E27 or E28) is present, refer to the description of
error code E27.
3. If anomaly is not confirmed in above-mentioned "1" or "2", it is refrigerant overcharge.
(1) Release the refrigerant from the access port of the low pressure service valve.
Corrective
Action
(2) Open the valve very slowly. Use caution for oil leak out.
(3) As CO
(4) After completing refrigerant charge, close the access port of the low pressure service
valve. (Set the low pressure service valve to the back seated position.)
4. When the "check content 2 or 3" above is abnormal:
Replace the high pressure sensor or the control PCB (CS1-PCB).
electronic expansion vale (MOV4) failed
• Refer to "Service Pipe Connection/Disconnection Method".
• Set the low pressure service valve to the Mid-position (the access port is open),
and the high pressure service valve to the back seated position.
Note: Release refrigerant slowly to avoid oil leak out.
refrigerant is heavier to air, use caution for gas stagnation.
2
Detected Gas cooler fan motor anomaly
Content
(10th Trip)
Detected
High pressure anomaly (1st to 6th Trip)
Content
27