Airwell AWAU-YDV1010-H13, Service Manual

Page: 165 / 187

163
Failure code
Outdoor
digital
display tube:
114-0,1
Indoor wired
controller:
72
Indoor unit LED status
LED5 Failure description:
DC under voltage of module 1 and 2
20 times
Outdoor unit LED status
LED1 LED2
Normal Normal
1. Model Failure diagnosis and troubleshooting
Flow Logic III series
Diagnosis Troubleshooting
2. Abnormity detection method
◆
Check if the power
voltage is too low and results
in voltage decrease after
rectification;
◆
Check if the PTC is in
normal conditions;
◆
Check if the cabinet is
correctly wired.
3. Abnormity confirmation
conditions
Raise failure alarm when
power voltage<DC420V.
INV control board recovers
automatically when voltage
>DC420V
4. Possible causes
◆
Incorrect wiring may result
in under voltage alarm;
◆
PTC or relay damage may
result in under voltage;
◆
Low power voltage may
result in under voltage.
Check if the supply voltage is normal
and the cabinet is wired correctly.
Check if the power relay and
PTC is contacted.
Test if the voltage of DC bus is
below 420V.
Replace and compare the
neighboring electrical cabinet
by troubleshooting.
Adjust or replace the power
relay.
The detection circuit of variable
frequency board is damaged,
replace the board.
Adjust the supply voltage or
rewire the cabinet in accordance
with circuit diagram.
Y
Y
Y
N
N
N