Daikin RXSQ24TAVJU, Service Manual

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Troubleshooting by Error Code SiUS331708EA
171 Service Diagnosis
Troubleshooting
Notes:
∗
1. Measurement of power wire connector.
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%).
∗
2. Measurement of signal wire connector.
Remove the X2A connector and measure the resistance between GND and V
CC
, H
W
, H
V
, or H
U
terminals of the motor connector (with five conductors).
YES
NO
Turn on the power.
Remove the signal connector
from the fan motor and check
the resistance (
∗
2).
The resistance
among U, V, and W are unbalanced
or short circuited.
YES
NO
YES
NO
Replace the fan PCB (A2P).
The HAP
lamp of the indoor
unit PCB (A1P) blinks and
the HAP lamp of the fan
PCB (A2P) is
off.
Between V
CC
and GND
terminals, and between GND
and H
W
, H
V
, or H
U
terminals are
short-circuited.
Replace the indoor fan
motor.
Replace the indoor fan
motor.
Replace the indoor fan
motor.
A
5 Gray
4 Pink
3 Orange
2 Blue
1 Yellow
GND
Vcc
Hw
H
V
H
U
5 Red
4 —
3 White
2 —
1 Black
U
V
W
Connector power wire use (X1A) Connector signal wire use (X2A)