Daikin RTSQ20PY1 Service Manual page 271

SiBE31-801_C
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 Page 216~217 for how to check)
When Confirmation of malfunction 3 shows as follows:
→ Fan motor 1 (M1F)
When Confirmation of malfunction 3 shows as follows:
→ Fan motor 2 (M2F)
Identify outdoor unit based on Confirmation of malfunction 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 PCB to
measure the following resistance value.
Judgement 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 the fan motor.
Replace the inverter PCB.
With single systems
For fan motor 1: replace the
inverter PCB (A4P)
For fan motor 2: replace the fan
inverter PCB (A5P)
With multi systems
For fan motor 1: replace the fan
inverter PCB (A4P)
Measure the
resistance
between Vcc-
UVW and
GND-UVW.
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