Daikin F-Series Service Manual page 254

SiBE12-712C
Troubleshooting
Service Diagnosis
Be sure to turn off power switch before connect or disconnect connector,
Caution or parts damage may be occurred.
Check indoor unit also, because a comunication circuit fault
may be caused by the problem related to the indoor unit.
Check supply voltage
Rated voltage?
YES
Check varistor (V1) on the
outdoor unit PCB
Is it damaged?
NO
Check fuse (FU1) on the outdoor
unit PCB
Does it have conductivity?
YES
Check thermal fuse on the
terminal board
Does it have conductivity?
YES
Check +5V and GND on the
outdoor unit PCB
Power on again
Wait more than 10 sec.
5 V±0.5 V
YES
Continued to the next page
NO
YES
NO
NO
Check terminal board connecting
wire for proper connection
Firmly connected?
NO
NO
Troubleshooting
Rectify the power supply.
Replace the varistor.
Replace the fuse.
YES
Replace thermal fuse on
the terminal board.
Reconnect properly.
Replace terminal board.
Replace thermal fuse on
the terminal board.
Replace outdoor unit PCB.
(R7152)
243