31
Inverter-related indication “Compressor does not operate”
Error
code
Abnormality
Possible cause
Symptom
Measures
E56
Compressor
cannot be
activeted for
more than 1.5
hours.
1. Locate the trouble and decide the measures.
• Decide the measures by checking the followings.
(1) Defective connector connections.
(Board-side, wire to wire, comp-side)
(2) Resistance of compressor’s winding
2. Flowchart of troubleshooting
• Defective wir-
ing continuity
• Trouble of the
control board
• Defective con-
nection of con-
nectors related
to compressor
(board-side,
relay, comp-side)
• Defective wiring
connecting of the
compressor
• Trouble of con-
trol board
• Trouble of com-
pressor
3. Recheck after measures
• After any measures are taken, unplug and plug power cord
again to check if the compressor operates properly.
• If the compressor can operate properly for more than 1
minute after power cord is plugged again, it’s presumed
that the cause of trouble is eliminated.
*If the cause of trouble cannot be eliminated,
E56
will be dis-
played again 1 minute later after the power cord is plugged
again.
*If the control board has been replaced,
E56
won’t be dis-
played even though the cause of trouble is still not elimi-
nated. In such a case, perform the ice making test operation
to check what the error is. At the same time, also confirm
that the compressor is operating for more than 3 minutes and
each compartment is getting cooled.
start
Connector CN50G on the
control board is properly
connected?
The connector of compressor
is properly connected?
Remove the CN50G
connector on the control
board, and measure the
winding resistance on the
compressor. , and
(Point1). Is the resistance
approx. 12.4
Ω
(at 20ºC)?
Measure the
resistance of
compressor’s
winding between
individual
terminals (Point 2).
Is the resistance
approx. 12.4
Ω
(at 20ºC)?
Is compressor being
energized at startup?
Exchange the unit.
Connect properly.
Exchange
the unit.
Replace the lead wire assembly.
Replace the control board.
Replace it only when error display
keeps blinking even though all the
above mentioned connectors are
properly connected.
Check
No
Yes
Yes
Yes
Yes
Yes
No
No
No
No
Treatment
Compressor
Control board
Point+2 (to measure resistance)
Point+1 (to measure resistance)
For checking the connection
to compressor
For checking the lead wire
assembly to compressor
Lead wire assembly
CN50G
E57
Replace the control board.
Inverter drive
module abnor-
mality
Failure of the
inverter drive mod-
ule in the control
P.C. board
Overcurrent is
detected in the
inverter drive
module before
starting the com-
pressor, and the
compressor does
not start rotating.
