Mitsubishi Electric MSZ-D30NA Service Manual page 70

I Check of HPS
1. Disconnect the connector CN681 in the electronic control P.C. board.
2. Check the resistance of HPS 1 minute after the outdoor unit power supply was turned OFF.
Check the resistance between each terminal.
Reconnect CN681.
Turn ON power supply to the indoor and outdoor unit.
3 minutes later, start EMERGENCY OPERATION.
Is HPS protection displayed immediately after
compressor starts?
J Check of bus-bar voltage
Blink 5 times
Replace the power board.
Turn ON power supply. Start
operation.
Confi rm LED1 indication lamp
on the outdoor electronic con-
trol P.C. board.
Blink 9 times
Replace the outdoor elec-
tronic control P.C. board.
Turn OFF power supply before removing P.C. board.
0 Ω
No
Normal
•Check the voltage of power supply.
•Confi rm outdoor unit failure mode
recall function. (Refer to 10-2.2)
Confi rm LED1 indication lamp on
the outdoor electronic control P.C.
board.
Blink 6 times
Replace the outdoor elec-
tronic control P.C. board.
Normal.
Lighting
Replace HPS.
Infi nity
Replace the outdoor electronic
Yes
control P.C. board.
Replace the outdoor elec-
tronic control P.C. board.
Turn ON power supply. Start
operation.
Confi rm LED1 indication lamp
on the outdoor electronic con-
Lighting
trol P.C. board.
Replace the power board.
36
Lighting
Blink 9 times