Daikin FTXZ25NV1B Service Manual page 189

SiMT041311E
Troubleshooting
Service Diagnosis
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.
Is the
power supply voltage
fluctuation within ±10% from
the rated value?
YES
Check if the unit is earthed.
Earthed?
YES
Check the varistor on the outdoor
unit PCB.
Burst?
NO
Check the fuse on the outdoor
unit PCB.
Does the fuse have
continuity?
YES
Check the thermal fuse on the
terminal board of the outdoor
unit.
Does the thermal fuse
have continuity?
YES
Check +5V and GND on the
outdoor unit PCB.
Turn the power on again.
Wait more than 10 seconds.
Start fan operation with the
remote controller.
5 V ± 0.5 V
YES
Go to the next page.
NO
NO
YES
NO
Are the
NO
connecting wires on
the terminal board properly
connected?
YES
∗ Cancel the standby electricity
saving function by starting fan
operation with the remote controller.
NO
Troubleshooting
Correct the power supply.
Earth the system.
Replace the varistor.
Replace the fuse.
NO
Reconnect the wire
properly. Replace the
terminal board. Replace the
thermal fuse on the terminal
Replace the thermal fuse
on the terminal board.
Replace the outdoor unit
PCB.
(R19686)
174