30
Inverter-related indication “Compressor does not operate”
Error
code
Abnormality
Possible cause Symptom
Measures
E50
• Abnormal
start-up
• Abnormal syn-
chronization
• 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 abnor-
mal.
• Defective reac-
tor on the N/F
board
Replace the control board.
E52
E52
displays 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,
99~121V.
Start
Measure the voltage of
power supply.
99V or
less
121V or more
Does 121V AC run
between CN1A ter-
minals and , on
the control board?
(See page 42.)
Arrange power supply to make the volt-
age within 121V and conduct the following
checks.
Check the
connection
between filter
board and
control board.
Connect
them
properly.
Abnormal
Replace the
filter board.
Yes
Normal
Replace the
control board.
No
Trouble of
inverter software
reset function
• When the
inverter driving
software mal-
functions due to
electric noise.
Unplug the power cord and wait more than 10 minutes then plug it again
No error code display
Explain to customer.
E53
• Compressor
motor gets
locked.
• Defective circuit
on control board
• Defective con-
tact of CN50G
on control board
Compressor
does not
rotate.
Compressor
does not
rotate.
Start
Remove the CN50G
connector on the con-
trol board, and meas-
ure the resistance
on the compressor.
Are the resistances
between the terminals
- , - , and
- respectively
approx. 12.4 (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 compres-
sor’s winding
between each
terminal. Is
the resistance
approx. 12.4
(20 )?
No
No
Replace the
compressor.
*Replace lead wire assembly.
*Is compressor
energized at
startup?
Check the connection status
of the CN50G connector on
the control board.
No
Correct the
connection of
the CN50G
connector on
the control
board.
Abnormal
Replace the
control board.
Yes
Yes
Normal