Failure Diagnosis - Panasonic OCU-CR1000VF8A 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
Meaning
code
High pressure
E011
anomaly (7th incident)
Discharge gas
E031 temperature anomaly
(3rd incident)
Discharge gas
E041 temperature sensor
anomaly
Low pressure sensor
E05
anomaly
High pressure sensor
E06
anomaly
Suction gas
E07 temperature sensor
anomaly
E091 Oil level anomaly
Discharge gas
E101 temperature anomaly
(1st to 2nd incident)
Inverter
E181,
communication
E183
anomaly
Controller
E19 communication
anomaly
Radiator temperature
E201
anomaly
Radiator temperature
E221
sensor anomaly
Ambient temperature
E23
sensor anomaly
Gas cooler fan motor
E271
anomaly
High pressure
E311 anomaly (1st to 6th
incident)
Refrigerant flood back
E32
alarm
Intermediate pressure
E36 anomaly (1st to 6th
incident)
Cause
Increased high pressure caused a high
pressure anomaly.
Abnormal stop caused by increased
discharge temperature to 118°C or
higher occurred three times in two
hours.
Discharge gas temperature sensor
became abnormal (open circuit
condition).
Low pressure sensor became
abnormal (open circuit condition).
High pressure sensor became
abnormal (open circuit condition).
Suction gas temperature sensor
became abnormal (open circuit
condition).
Low oil level condition continued for
10 min.
Discharge gas temperature increased
to 118°C or higher and generated
an abnormal stop. Or discharge gas
temperature sensor shorted.
No serial communication signal
between "control PCB" and "Inverter"
No controller signal exists in
communication.
Inverter radiator temperature increased
to 100°C or higher and stopped
abnormally.
Radiator temperature sensor became
abnormal (open circuit condition).
Ambient temperature sensor became
abnormal (open circuit condition).
Gas cooler fan motor became
abnormal. (The fan rotation speed
significantly deviated from the set
rotation speed.)
Increased high pressure caused a high
pressure anomaly.
Suction gas superheat (difference
between "suction gas temperature" and
"evaporating temperature calculated
from low pressure") became 1 K or
below continuously for 2 min.
Increased intermediate pressure
caused an abnormal intermediate
pressure.
Correction method
(1) Investigate the cause of high pressure anomaly.
(2) Check for the presence of any anomalies of the high pressure sensor.
Follow the procedure shown in "Failure Diagnosis at the time of Abnormal
Discharge Gas Temperature."
(1) Search for the cause of increasing discharge gas temperature.
(2) Check the connection of control PCB "2P4 discharge 1 connector."
(3) Check the resistance value of the discharge gas temperature sensor
(Refer to "Method of Checking Sensor Characteristics").
(1) Check the connection of control PCB "2P4 discharge 1 connector."
(2) Check the resistance value of the discharge gas temperature sensor
(Refer to "Method of Checking Sensor Characteristics").
(1) Check the connection of control PCB "3P1 low pressure connector."
(2) Check the output voltage of the low pressure sensor (Refer to "Method
of Checking Sensor Characteristics").
(1) Check the connection of control PCB "3P3 high pressure connector."
(2) Check the output voltage of the high pressure sensor (Refer to
"Method of Checking Sensor Characteristics").
(1) Check the connection of control PCB "2P9 U inlet connector."
(2) Check the resistance value of the suction gas temperature sensor
(Refer to "Method of Checking Sensor Characteristics").
(1) Investigate the cause of oil level anomaly.
(2) Check the connection of control PCB "6P11 electronic expansion valve
1 connector."
(3) Check the coil attachment condition and resistance value of the oil
control electronic expansion valve (MOV1).
When checking, refer to "Method of Checking the Resistance of
Electronic Expansion Valve Coil and Oil Level Switch."
(4) Check the oil level and add oil according to the "Oil Level Control
Method."
Comply with the "Failure Diagnosis at the time of Abnormal Discharge
Gas Temperature."
(1) Search for the cause of increasing discharge gas temperature.
(2) Check the connection of control PCB "2P4 discharge 1 connector."
(3) Check the resistance value of the discharge gas temperature sensor
(Refer to "Method of Checking Sensor Characteristics").
Check the communication line between control PCB "5P1 connector" and
Inverter A1000/V1000 connector."
(1) Check the communication line (control PCB "5P4, 5P5 connector").
(2) Set the communicating refrigeration unit No. to a value other than "0."
(1) Investigate the cause of the increasing radiator temperature.
(2) Check the connection of control PCB "2P31 Cooler 1 connector."
(3) Check the resistance value of the radiator temperature sensor (Refer
to "Method of Checking Sensor Characteristics").
(1) Check the connection of control PCB "2P31 Cooler 1 connector."
(2) Check the resistance value of the radiator temperature sensor (Refer
to "Method of Checking Sensor Characteristics").
(1) Check the connection of control PCB "2P8 ambient air connector."
(2) Check the resistance value of the ambient temperature sensor (Refer
to "Method of Checking Sensor Characteristics").
(1) Check for the presence of a fan lock, fan dislocation, etc.
(1) Investigate the cause of high pressure anomaly.
(2) Check for the presence of any anomalies of the high pressure sensor.
Check the cause of refrigerant flood back operation.
(1) Investigate the cause of intermediate pressure anomaly.
(2) Check for the presence of any anomalies of the intermediate pressure
sensor.
EN - 47