Panasonic OCU-CR400VF8 Operating Instructions And Installation Instructions page 45

Failure Diagnosis
Error Code
Error
Meaning
code
Unit outlet pressure
E37
anomaly (1st to 6th
incident)
Intermediate pressure
E46
anomaly (7th incident)
Unit outlet pressure
E47
anomaly (7th incident)
Unit outlet sensor
E57
anomaly
Gas cooler outlet
E59
temperature sensor
anomaly
E6X1
Inverter anomaly
~E7X1
Intermediate pressure
E81
sensor anomaly
Unit outlet pressure
E88
sensor anomaly
Indication
Anomaly that occurred in the past.
Alarm (red) LED blinks Up to 50 past error codes are
saved in the "Alarm History."
Digital display "-CH-" CR2-EN PCB is in the check mode.
Cause
Increased unit outlet pressure caused a
unit outlet pressure anomaly.
Increased intermediate pressure
caused an intermediate pressure
anomaly.
Increased unit outlet pressure caused a
unit outlet pressure anomaly.
Unit outlet temperature sensor became
abnormal (open circuit condition).
Gas cooler outlet temperature sensor
became abnormal (open circuit
condition).
The inverter operation became
abnormal.
Intermediate pressure sensor became
abnormal (open circuit condition).
Unit outlet pressure sensor became
abnormal (open circuit condition).
Meaning
(1) Investigate the cause of unit outlet pressure anomaly.
(2) Check for the presence of any anomalies of the unit outlet pressure
sensor.
(1) Investigate the cause of intermediate pressure anomaly.
(2) Check for the presence of any anomalies of the intermediate pressure
sensor.
(1) Investigate the cause of unit outlet pressure anomaly.
(2) Check for the presence of any anomalies of the unit outlet pressure
sensor.
(1) Check the connection of CR2-EN PCB "2P5 U outlet connector."
(2) Check the resistance value of the unit outlet temperature sensor
(Refer to "Method of Checking Sensor Characteristics").
(1) Check the connection of CR2-EN PCB "2P6 GC outlet connector."
(2) Check the resistance value of the gas cooler outlet temperature sensor
(Refer to "Method of Checking Sensor Characteristics").
Comply with the "Failure Diagnosis of Inverter Unit."
(1) Check if Power source is connected to power source terminal base.
(2) Confirm whether an overload operation is taking place.
(3) Check for the presence of a power source voltage drop or power
missing phase.
(4) Check if the compressor is locked.
(5) Check if INV4-H-EN PCB "U,V,W terminal" are connected to
compressor.
(6) Check if INV4-MF-EN PCB CN9 and CN6 or CN30 are connected to
fan motor.
(1) Check the connection of CR2-EN PCB "3P2 intermediate
pressure connector."
(2) Check the output voltage of the intermediate pressure sensor (Refer
to "Method of Checking the Resistance of Electronic Expansion Valve
Coil").
(1) Check the connection of CR2-EN PCB "3P4 U outlet connector."
(2) Check the output voltage of the unit outlet pressure sensor (Refer to
"Method of Checking Sensor Characteristics").
Correction method
Check the error code in the table above
and eliminate the cause.
Then, align the rotary switch (knob) to
"Operation," and press ▲ or turn the
operation switch "OFF."
Then, LED stops blinking.
Set CR2-EN PCB slide switch SW15
to "Control."
EN - 45
Correction method
Remarks
Set CR2-EN PCB slide switch
SW15 to "Check," and DIP switch
SW13-1 and SW13-6 to "ON" and
supply power to enter the check
mode.