Daikin VRV II-Q RQYQ8-48PY1B Service Manual page 135

SiBE341027
Troubleshooting
Note:
*1. Check the procedure for fan motor connector
Service Diagnosis
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 error code "
the monitor mode.
When confirmation of error 3 shows as follows:
→ Fan motor 1 (M1F)
When confirmation of error 3 shows as follows:
→ Fan motor (M2F)
Explanation for " "
Turn OFF the power supply.
Is the
signal wire connector
for the corresponding
fan motor normal?
Check the connector
of the fan motor (*1).
Are the
resistance of the fan motor lead
wire between Vcc and UVW and
between GND and UVW
balanced?
(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
H7
" in
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 INV. PCB.
For fan motor 1: replace the
INV. PCB (A5P)
For fan motor 2: replace the fan
INV. PCB (A7P)
Measure the Measure the
resistance resistance
between Vcc- between Vcc-
UVW and UVW and
GND-UVW. GND-UVW.
125