39
No
During the emergency operation,
does DC (2V or more [
MSZ-
EF∙VG-
E1
,
ET1
]/2V or less
[
MSZ-EF∙VG-
E2
,
ET2
, MSZ-
EF∙VGK-
E1
,
ET1
]) occur for 2
seconds between CN102 and
JPG/CN102 * on the indoor
electronic control P.C. board?
Replace the
indoor electronic
control P.C.
board.
Replace the
indoor power P.C.
board.
Yes
D How to check miswiring and serial signal error
Is serial signal
error indicated 6
minutes later?
Turn the main power supply ON.
Yes
• Reinstall either the unit or the light away from each other.
•
Attach a filter on remote control receiving section of the indoor unit.
No
Turn the main power supply
OFF.
Is there rated voltage in the power supply?
Yes
No
Check for incorrect indoor-outdoor connecting wiring.
Check the power supply.
• Turn OFF inverter-controlled lighting equipment.
• Turn OFF the power supply and then turn ON again.
• Press EMERGENCY OPERATION switch.
Is there rated voltage between outdoor terminal block S1 and S2?
Yes
Check for miswiring, broken wires, and loose
wire connection between the main power
supply and outdoor terminal block S1 and
between the main power supply and outdoor
terminal block S2.
Wait for 2 or more minutes after the main power supply is turned on.
Touch S2 and S3 with tester probes and start the emergency operation.
When the emergency operation starts, does the rated voltage occur for 2
seconds between indoor terminal block S2 and S3?
Yes
Turn the main power supply
OFF.
Turn the main power supply
ON.
Wait for 2 or more minutes after the
main power supply is turned ON.
Touch CN102 and JPG/CN102
* with tester probes and start the
emergency operation.
No
Does the indoor OPERATION
INDICATOR lamp (left) blink
continuously 6 minutes after
the emergency operation
starts?
No
Does the outdoor LED
light up?
Yes
Does the outdoor LED blink 6
times?
Yes
Confirm that the thermo
-
stat is OFF and wiring is
not loose.
No
Does DC (6V or more) occur
between indoor terminal block
S2 and S3?
Yes
Replace the outdoor inverter
P.C. board. 1
No
Turn the main power supply
OFF.
Replace the indoor power P.C.
board.
Start the emergency operation.
No
Yes
Repair completed.
Does DC (20V or more) occur
between indoor terminal block
S2 and S3 ?
No
Yes
Replace the outdoor inverter P.C. board. 1
Replace the indoor electronic
control P.C. board.
1.
Electric charge may remain
immediately after the main power
supply is turned OFF.
Perform the procedure after 3
minutes.
Replace the outdoor inverter
P.C. board. 1
Turn the main power supply ON.
Does the indoor OPERATION
INDICATOR lamp (left) blink
continuously 6 minutes after
the emergency operation
starts?
Yes
No
No
No
Was the indoor unit ever connected to
the Multi (MXZ) series and operated
(turned on)?
The connection information to the Multi series is stored
in the indoor unit. Refer to “Deleting the memorized
abnormal condition” described in 10-2.1 to clear the error
history. When the error history is being cleared, the con-
nection information also will be initialized. The indoor unit
will be compatible with a low-standby-power model after
initialization.
OK
Yes
MUZ-EF Type
* JGP:
MSZ-EF
·
VG-
E1
,
ET1
CN102 :
MSZ-EF
·
VG-
E2
,
ET2
,
MSZ-EF
·
VGK-
E1
,
ET1
OBH831A
