Daikin RTSQ20PY1 Service Manual page 264

Troubleshooting by Indication on the Remote Controller
Troubleshooting
253
A
No continuity of
fuse (FIU) on
the fan inverter
PCB.
NO
Unable to rotate the fan
manually with ease when
removing the connector of
the fan motor.
NO
Resistance value between
the power supply wire
terminal of fan motor and the
motor frame (metal) is 1MΩ
and below.
NO
CHECK 1 (Referring to the information on P.339)
Check fan motor connector (power supply wire)
The resistance value
between UVW phases of
fan motor is out of balance,
or short circuit between
UVW phases.
NO
(Referring to the information on P.339)
CHECK 2
Check fan motor connector (signal wire)
The signal wire short
circuits between Vcc
and GND and
between UVW and
GND.
NO
Put the power supply ON to check the
following LED lamps.
1) HAP lamp on the compressor PCB (A4P)
2) HAP lamp on the fan inverter PCB (A5P)
HAP lamp for the A5P
does not blink on the
condition that HAP lamp
for A4P is blinking.
NO
YES
YES
YES
YES
YES
YES
SiBE31-801_C
Replace the fan inverter
PCB.
Replace the corresponding
fan motor.
Replace the corresponding
fan motor.
Replace the corresponding
fan motor.
Replace the corresponding
fan motor.
Replace the fan inverter
PCB.
Replace the fan motor 2.
Troubleshooting