40
D How to check miswiring and serial signal error
MUZ Type
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.
A
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.
No
Turn the main power supply ON.
B
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
• Turn OFF inverter-controlled lighting
equipment.
• Turn OFF the power supply and then
turn ON again.
• Press EMERGENCY OPERATION
switch.
A
Is serial signal
error indicated 6
minutes later?
B
Yes
• Reinstall
either the unit
or the light
away from
each other.
•
Attach a filter
on remote
control receiv-
ing section
of the indoor
unit.
No
When the emergency operation starts, does the rated voltage occur for 2
seconds between indoor terminal block S2 and S3?
Yes
Does the indoor upper lamp of OPERATION
INDICATOR lamp blink continuously 6 min-
utes after the emergency operation starts?
No
Does the outdoor LED light up?
Replace the indoor
electronic control
P.C. board.
Yes
Does the outdoor LED blink 6
times?
Yes
Confirm that the thermostat is OFF
and wiring is not loose.
No
Does DC (6 V or more) occur
between indoor terminal block S2
and S3?
Yes
Replace the outdoor inverter P.C. board.
*1
No
Turn the power supply OFF.
Replace the indoor electronic
control P.C. board.
Start the emergency operation.
No
Yes
Yes
Repair completed.
Does DC (20 V or more) occur
between indoor terminal block S2
and S3?
No
Replace the outdoor inverter P.C. board.
*
Replace the indoor electronic
control P.C. board.
*1
Electric charge may remain immediately
after the power supply is turned OFF.
Perform the procedure after 3 minutes.
Replace the outdoor inverter P.C. board.
*1
Turn the power supply ON.
Does the indoor upper lamp of
OPERATION INDICATOR lamp
blink continuously 6 minutes after
the emergency operation starts?
Yes
No
No
MUZ-AP71
MUZ-AP25/35/
MUZ-AP42/50/60
OBH788C
Содержание WSH-AP42WI
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