81
Check of HPS
Infinity
0
Ω
Yes
No
1. Disconnect the connector CN681.
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 the power supply to the indoor and outdoor unit.
3 minutes later, start EMERGENCY OPERATION.
Is HPS protection displayed
immediately after compressor
starts?
Replace HPS.
Replace the electronic control P.C. board.
Normal
• When the operation frequency does not go up from lowest frequency.
CN681
Outdoor electronic control
P.C. board
MXZ-3B68/4B71/4B80/5B100VA
Check of outdoor fan motor
• Fan motor does not operate or stops operating shortly after starting the operation.
Yes
Yes
Yes
No
(Fixed to either 5V or 0V DC)
No
No
Disconnect CN932 and measure the
resistance of the outdoor fan motor.
Turn ON the power supply.
Rotate the outdoor fan motor manually and measure the voltage of
CN931.
Between (+) and (-)
Between (+) and (-)
Between (+) and (-)
Is the resistance of outdoor fan motor
normal? (Refer to 11-5.)
Does the outdoor fan motor rotate smoothly?
Does the voltage between each terminal become 5V DC and 0V DC
repeatedly?
Replace the outdoor fan motor.
Replace the inverter P.C. board or the outdoor
electronic control P.C. board.
CN931
CN932
Outdoor electronic control
P.C. board
MXZ-2B
MXZ-3B/4B/5B
Inverter P.C. board
OBH554D
Summary of Contents for MXZ-2B30VA
Page 19: ...19 WIRING DIAGRAM 6 MXZ 2B30VA MXZ 2B40VA MXZ 2B52VA TB3 TB2 TB1 OBH554D ...
Page 20: ...20 MXZ 3B54VA OBH554D ...
Page 21: ...21 MXZ 3B68VA OBH554D ...
Page 22: ...22 MXZ 4B71VA OBH554D ...
Page 23: ...23 MXZ 4B80VA OBH554D ...
Page 24: ...24 MXZ 5B100VA OBH554D ...