Daikin 2MXS40H2V1B Service Manual page 194

Troubleshooting for Outdoor Unit
Troubleshooting
183
Be sure to turn off the power switch before connecting or disconnecting
Caution connectors, or parts may be damaged.
Check indoor unit also, because a communication circuit fault
may be caused by the problem related to the indoor unit.
Check the power supply voltage.
Rated voltage?
YES
Check the varistor on the outdoor
unit PCB.
Damaged?
NO
Check the fuse on the outdoor
unit PCB.
Does the fuse have
continuity?
YES
Check the thermal fuse on the
terminal board.
Does the fuse have
continuity?
YES
Check +5V and GND on the
outdoor unit PCB.
Power on again.
Wait for more than 10 sec.
5 V ± 0.5 V
YES
(1)
Continued to the next page
NO
YES
NO
NO Check the terminal board
connecting wire for proper
connection.
Firmly connected?
NO
NO
SiBE121123_A
Rectify the power supply.
Replace the varistor.
Replace the fuse.
YES
Replace the thermal fuse
on the terminal board.
Reconnect the terminal
board connecting wire
properly. Replace the
terminal board. Replace
the thermal fuse on the
terminal board.
Replace the outdoor unit
PCB.
(R18131)
Service Diagnosis