Failure Diagnosis - Panasonic OCU-CR200VF5 Operating Instructions And Installation Instructions

Failure Diagnosis

Error Code
(1) When the rotary switch (knob) is at [OPERATION] position, the digital display on the control PCB alternately
displays low pressure, high pressure and error code (E ***).
< Error Code Table >
Error code Meaning
High pressure
abnormal
E01 (7th time) or High
Pressure Switch
Activated
Discharge gas
temperature abnormal
(3rd time)
E03
Discharge gas temp
sensor abnormal
E04
Low pressure sensor
E05 abnormal
High pressure sensor
E06 abnormal
Suction gas temp
sensor abnormal
E07
Discharge gas
temperature abnormal
(1st to 2nd time)
E10
Inverter
E18 communication
abnormal
Communication
abnormal
E19
Ambient temp sensor
abnormal
E23
Gas cooler fan motor
E27 abnormal
(1st to 9th time)
Gas cooler fan motor
E28 abnormal
(10th time)
Cause
High pressure increased to abnormal level.
Abnormality stopping caused by discharge
gas temperature exceeding 118 °C occurred 3
times in 2 hours.
Discharge gas temperature sensor became
abnormal (open).
Low pressure sensor became abnormal
(open).
High pressure sensor became abnormal
(open).
Suction gas temperature sensor became
abnormal (open).
Discharge gas temperature exceeded 118 °C
and caused abnormality stop.
Or discharge temp sensor shorted.
No serial communication signals between
"Control PCB" and "Inverter-PCB".
No controller signal exist in communication.
Ambient temperature sensor became abnormal
(open).
Gas cooler fan motor became abnormal.
(Fan rotation speed largely deviated from the
command rotation speed.)
Gas cooler fan motor became abnormal.
(Fan rotation speed largely deviated from the
command rotation speed.)
EN - 43
Method of Action (Listed)
(1) Check the cause of high pressure abnormality.
(2) Check if abnormality exists in the high pressure
sensor.
Follow the procedure shown in "Failure diagnosis of
abnormal discharge gas temperature".
(1) Investigate the cause of high discharge gas
temperature.
(2) Check the connection of "2P6 Discharge Connector" of
the control PCB.
(3) Check the resistance value of the discharge gas
temperature sensor.
(1) Check the connection of "2P6 discharge connector" of
the control PCB.
(2) Check the resistance value of the discharge gas
temperature sensor.
(1) Check the connection of "3P1 low pressure connector"
of the control PCB.
(2) Check the output voltage of the low pressure sensor.
(1) Check the connection of "3P3 high pressure
connector" of the control PCB.
(2) Check the output voltage of the high pressure sensor.
(1) Check the connection of "2P5U inlet connector" of the
control PCB.
(2) Check the resistance value of the suction gas
temperature sensor.
Follow the procedure shown in "Failure diagnosis of
abnormal discharge gas temperature".
(1) Investigate the cause of high discharge gas
temperature.
(2) Check the connection of "2P6 discharge connector" of
the control PCB.
(3) Check the resistance value of the discharge gas
temperature sensor.
Check the communication line between "2P11INV
connector" of the control PCB and "CN14 connector" of the
inverter-PCB.
(1) Check the communication line ("5P2, 5P3 connector"
of the control PCB)
(2) Set the communication refrigeration machine No. other
than "0".
(1) Check the connection of "2P1 ambient connector" of
the control PCB.
(2) Check the resistance value of the ambient temperature
sensor.
(1) Check fan locked or dismantled.
(2) Check connection of "CN007 connector" of the
inverter-PCB.
(1) Check fan locked or dismantled.
(2) Check connection of "CN007 connector" of the
inverter-PCB.