Daikin VRV III REYQ8PY1 Service Manual page 280

Si37-701
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 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 " "
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 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)
5 Gray
4 Pink
3 Orange
2 Blue
1 Yellow
Troubleshooting by Indication on the Remote Controller
Master unit
Slave unit 1
Slave unit 2
System
NO
YES
NO
YES
X2A
GND
Vcc
W
V
U
Ensure correct connection.
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)
Measure the
resistance
between Vcc-
UVW and
GND-UVW.
(V2799)
269