Daikin VRV IV-S RXTQ-TAVJU Series Service Manual page 158

Troubleshooting by Error Code
Troubleshooting
∗1. Measurement of power wire connector.
Note:
∗2. Measurement of signal wire connector.
145
A
The resistance
among U, V, and W are unbalanced
or short circuited.
NO
Remove the signal connector
from the fan motor and check
the resistance (∗2).
Between V and GND
CC
terminals, and between GND
and H , H , or H terminals are
W V U
short-circuited.
NO
Turn on the power.
The HAP
lamp of the indoor
unit PCB (A1P) blinks and
the HAP lamp of the fan
PCB (A2P) is
off.
NO
Remove the X1A connector from the fan PCB (A2P) and measure the resistance between the U
and V, V and W, and W and U phases of the motor connector (with five conductors) and check
that each phase are balanced (within a permissible dispersion range of ±20%).
Remove the X2A connector and measure the resistance between GND and V
terminals of the motor connector (with five conductors).
Connector power wire use (X1A)
5 Red
4 —
3 White
2 —
1 Black
YES
YES
YES
Connector signal wire use (X2A)
5 Gray
U
4 Pink
3 Orange
V
2 Blue
1 Yellow
W
SiUS331604E
Replace the indoor fan
motor.
Replace the indoor fan
motor.
Replace the fan PCB (A2P).
Replace the indoor fan
motor.
, H , H , or H
CC W V
GND
Vcc
Hw
H
V
H
U
Service Diagnosis
U