Chek Of Hps; Check Of Bas-Bar Voltage - Mitsubishi Electric MXZ-2C20NA2-U1 Service Manual

1. Disconnect the connector CN63H in the outdoor control P.C. board.
2. Check the resistance of HPS after 1 minute has passed since the outdoor unit power supply was turned OFF.
Check the resistance between each terminal.
Reconnect CN63H.
Turn ON the power supply to the indoor and outdoor unit.
3 minutes later, start EMERGENCY OPERATION.
Is HPS protection displayed immediately
after compressor starts?
No
Normal
The other cases
Indoor unit does not operate. (different operating models in multi system)
• When you try to run 2 indoor units simultaneously, one for cooling and the other for heating, the unit which transmits signal to
• When the above situation occurs, set all the indoor units to the same mode, turn OFF the indoor units, and then turn them
back ON.
• Though the top of the indoor unit sometimes gets warm, this does not mean malfunction. The reason is that the refrigerant gas
Blink 5 times
Replace the outdoor power
P.C. board.
Turn ON power supply. Start
operation.
LED1 indication lamp
on the outdoor control P.C.
board.
Blink 9 times
Replace the outdoor control
P.C. board.
Turn OFF power supply before removing P.C. board.
OBH702G
Infinity
Yes
Replace the outdoor control P.C. board.
•Check the voltage of power supply.
•
recall function. (Refer to 11-2.2.)
LED1 indication lamp on the
outdoor control P.C. board.
Normal
Lighting
CN63H
Replace HPS.
Lighting
Replace the outdoor control
P.C. board.
Turn ON power supply. Start
operation.
LED1 indication lamp
on the outdoor control P.C.
Lighting
board.
Blink 9 times
Replace the outdoor power
P.C. board.
93
Outdoor control
P.C. board