Daikin RQYQ140-180PY1 Service Manual page 139

SiBE341001
Troubleshooting
Troubleshooting
Be sure to turn off power switch before connect or disconnect connector,
Caution
or parts damage may be occurred.
Check the fan motor corresponding to the malfunction code
H7
" " in the monitor mode.
(Refer to P.106~P.107 for how to check.)
When Confirmation of malfunction 3 shows as follows:
→ Fan motor 1 (M1F)
Explanation for " "
Cut the power supply off.
Check if
signal wire connector for
the corresponding fan
motor is normal.
Check the connector
of the fan motor ( ∗ 1).
Check if the resistance of the fan
motor lead wire between Vcc and
UVW and between GND and UVW
are balanced.
∗ 1.Check the procedure for fan motor connector
(1) Power OFF the fan motor.
(2) Remove the connector (X2A or X4A) on the PCB to measure
the following resistance value.
Judgement criteria: resistance value between each phase is
within ±20%
for signal wires (X2A or X4A)
5 Gray 5 Gray
4 Pink
3 Orange
2 Blue
1 Yellow
Master unit
Slave unit 1
Slave unit 2
System
NO
YES
NO
YES
Connector
X2A
GND
Vcc
W
V
U
Troubleshooting by Remote Controller
Ensure correct connection.
Replace the fan motor.
Replace the inverter PCB.
For fan motor 1: replace the
inverter PCB (A4P)
Measure the Measure the
resistance resistance
between Vcc- between Vcc-
UVW and UVW and
GND-UVW. GND-UVW.
130