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When OPERATION INDICATOR lamp flashes ON and OFF in every 0.5-second.
Outdoor unit doesn't operate.
How to check mis-wiring
D
• Turn ON the power supply. (indoor/ outdoor unit)
• Press once EMERGENCY OPERATION switch.
Yes
Make them sure.
1. Turn OFF the power supply (indoor/ outdoor unit) and disconnect indoor and outdoor
connecting wire at the terminal block 3 of the indoor unit.
2. Short-circuit terminal block N-3 of indoor unit by lead wire.
3. Turn ON the power supply (indoor unit) and press once EMERGENCY OPERATION switch.
As for outdoor unit, refer to service manual OB370.
MS-GA80VB
Start
After 3 minutes, mis-wiring is indicated
(0.5-second ON, 0.5-second OFF)
on OPERATION INDICATOR
lamp on indoor unit.w
Is this mis-wiring, poor contact,
or wire disconnection?
No
Is there 20V DC between both ends of
R132 on the indoor electronic control P.C.
board ?
( By tester, the stylus is between 0 ~ 20V. )
Yes
• Turn OFF the power supply. (indoor unit)
• Disconnect the lead wire that terminal
block N-3 of the indoor unit is
short-circuited.
• Connect ON indoor/ outdoor connecting
wire.
Turn ON the power supply. (outdoor unit)
Is there 230V AC between L-N
on the outdoor terminal block?
Yes
Is there 5V DC between J101 + -J401 -
(MU-GA80VB) on the deicer P.C. board?
Yes
During EMERGENCY OPERATION, is there
10V DC between both ends of R601 on the
deicer P.C. board?
(By tester, the stylus is between 5 ~10V.)
Yes
Replace the deicer P.C. board.
w Short circuit of JPG and JPS on the indoor electronic control
P.C. board enables self -check to be displayed in 3 seconds.
No
Replace the indoor electronic
control P.C. board.
No
Check the outdoor power supply
and connection of wiring.
No
Replace the deicer P.C. board.
Make the wiring between CN730
No
on the deicer P.C. board and
outdoor terminal block correct.
17
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