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Inverter-related indication “Compressor does not operate”
Error
code
Abnormality
Possible cause Symptom Treatment
e50
•Abnormal start-
up
•Abnormal
synchronization
•Trouble of
overcurrent
detection
•When there is
any trouble in the
circuit which
detects phase
current of com-
pressor.
e51
Compressor
does not
rotate.
Replace the control board.
Bus-bar
voltage is
abnormal.
•Power supply
voltage is
abnormal.
•Defective reactor
on the N/F board
Replace the control board.
e52
e52
display again.
Check the error code by performing the ice making test operation.
Trouble of
inverter circuit
Compressor
does not
rotate.
Arrange
power sup-
ply to obtain
the rated
voltage,
180-280V.
Start
Measure the voltage of
power supply.
160V or
more
280V or more
Does AC230V run
between CN51 ter-
minals 1 and 3, on
the control board?
(See page 32.)
Arrange power supply to make the voltage
within 180-280V and conduct the following
checks.
Check the
connection
between filter
board and
control board.
Connect
them
properly.
Abno-
rmal
Replace the
filter board.
Yes Normal
Replace the
control board.
No
Trouble of
inverter software
reset function
•When the inverter
driving software
malfunctions.
Unplug the power cord and then plug it in 10 minutes.
No error code display
Explanation to customer
e53
•Compressor
motor gets locked.
•Defective circuit
on control board
•Defective contact
of CN50G on
control board
•Defective contact
of machine
chamber 6-pin
connector
Compressor
does not
rotate.
Compressor
does not
rotate.
Start
Disconnect 6-pin
connector in
machine cham-
ber to check
resistance
between each
terminal of 1, 2
and 3: Are they
approx. 9.3'
(20:)?
Exchange
the unit
Yes
*If control board is normal, compressor is energized
every 10 minutes.
Compressor vibrates at startup when it is being ener-
gized. Touch it with your hand to check.
Measure the
resistance of
compressor’s
winding
between each
terminal of 1,
2 and 3: Are
they approx.
9.3' (20:)?
No
No
Exchange
the unit
*Replace lead wire assembly C.
*Is compressor
energized at
startup?
Check the connection of the
connector CN50G on the
control board or the machine
chamber 6-pin connector.
No
Connect them
properly.
Abnormal
Replace the
control board.
Yes
Yes Normal
OA090-1.qxp 06.7.20 9:55 AM Page 21