How To Check Mis-Wiring - Mitsubishi Electric MSZ-G09SV Service Manual

When OPERATION INDICATOR lamp flashes on and off in every 0.5-second.
Outdoor unit doesn't operate.
V

How to check mis-wiring

• Turn ON the power supply.
• Press once EMERGENCY OPERATION switch.
After three minutes, mis-wiring is indicated
(0.5-second ON, 0.5-second OFF)
on OPERATION INDICATOR
lamp on indoor unit.w
Yes
Is this mis-wiring, poor contact,
Make them sure.
or wire disconnection?
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 once EMERGENCY OPERATION switch.
Is there 1V DC between both ends of PS132
on the indoor electronic control P.C. board ?
( By tester, the stylus is between 0 ~ 1V. )
1. Turn OFF the power supply.
2. Reconnect indoor/outdoor connecting wire to outdoor terminal block.
3. Reconnect connector CN601 to outdoor electronic control P.C. board.
4. Disconnect lead wire from compressor.
• Turn ON the power supply.
• Press once EMERGENCY OPERATION switch.
After three minutes, is the voltage 5V DC - 10V DC
between No. 3(+) and No. 1(-) at CN601on outdoor
terminal block?
Reconnect the indoor/ outdoor unit connecting wire.
Start
No
No
Yes
No
Yes
86
w Short circuit of JPG and JPS on the indoor electronic control
P.C. board enables self -check to be displayed in 3 seconds.
Replace the indoor electronic
control P.C. board.
Replace the outdoor electronic
control P.C. board.