17
How to check mis-wiring
C
1. Turn OFF the power supply and disconnect only terminal
block
3
of indoor/ outdoor connecting wire on indoor side.
2. Short-circuit terminal block
N
-
3
by lead wire.
3. Turn ON the power supply and press EMERGENCY OPERATION switch once.
When EMERGENCY OPERATION
is operated, is there 10V DC between both
ends of R601 on the deicer P.C. board?
(Refer to 8-5.)
However the stylus of a tester would be
between 5 ~10V.
Start
No
No
Is there 1V DC detected between both ends
of PS132 on the indoor electronic control P.C.
board ?
However, the stylus of a tester would be
between 0 and 20V.
• Turn ON the power supply.
• Press EMERGENCY OPERATION switch once.
Is this mis-wiring, poor contact,
or wire disconnection?
Make them sure.
Replace the indoor electronic
control P.C. board.
Is there 220-230V AC between
L
-
N
on the outdoor terminal block?
No
Check the outdoor power supply
and connection of wiring.
Is there 5V DC between J101 + -J401 - ?
(Refer to 8-5.)
Yes
No
Replace the deicer P.C. board.
Yes
No
Make the wiring between CN730
on the deicer P.C. board and
outdoor terminal block correct.
(Refer to 8-5.)
Replace the deicer P.C. board.
Yes
Yes
Yes
When the unit has mis-wiring, in 3 minutes,
OPERATION INDICATOR lamp on indoor unit
flash on and off at 0.5 second intervals.
w
w
Short circuit of JPG and JPS on the indoor electronic control
P.C. board enables self -check to be displayed in 3 seconds.
• Turn OFF the power supply.
• Disconnect the lead wire that terminal
block
N
-
3
is short-circuited.
• Connect ON indoor/outdoor connecting wire.
Turn ON the power supply.
Refer to indoor unit
service manual.
When OPERATION INDICATOR lamp flashes ON and OFF in every 0.5-second.
Outdoor unit dose not operate.
MU-A30ND
OB405E.qxp 09.10.14 9:16 AM Page 17
