Daikin VRV III REYQ8PY1, Service Manual

Page: 280 / 452

Si37-701 Troubleshooting by Indication on the Remote Controller
Troubleshooting 269
Troubleshooting
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
Ensure correct connection.
NO
YES
Check if
signal wire connector
for the corresponding fan
motor is normal.
Replace fan motor.
Replace inverter PC board.
For fan motor 1: replace inverter
PC board (A2P)
For fan motor 2: replace fan
inverter PC board (A5P)
NO
YES
Check if the
resistance of the fan
motor lead wire between Vcc and
UVW and between GND and
UVW are balanced.
Check the connector
of the fan motor (
∗
1).
Cut the power supply off.
∗
1. Check procedure for fan motor connector
(1) Power OFF the fan motor.
(2) Remove the connector (X2A or X4A) on the PC board to
measure the following resistance value.
Judgment criteria: resistance value between each phase is
within ±20%
Connector
for signal wires (X2A or X4A)
Check the fan motor corresponding to the malfunction code
“
H7
” in the monitor mode.
(Refer to P226~227 for how to check)
When check 3 shows as follows:
→
Fan motor 1 (M1F)
When check 3 shows as follows:
→
Fan motor 2 (M2F)
Identify outdoor unit based on Check 4.
Explanation for “ ”
Master unit
Slave unit 1
Slave unit 2
System
X2A
GND
(V2799)
Measure the
resistance
between Vcc-
UVW and
GND-UVW.
5 Gray
Vcc
W
V
U
4 Pink
3 Orange
2 Blue
1 Yellow