Airwell AWAU-YDV1010-H13, Service Manual

Page: 147 / 187

145
Failure code
Outdoor
digital
display tube:
39-2, 3
Indoor wired
controller:
27
Indoor unit LED status
LED5 Failure description:
The unit compression ratio too low failure
20 times
Outdoor unit LED status
LED1 LED2
Normal Normal
1. Model Diagnosis and troubleshooting
Flow Logic III series
Diagnosis Troubleshooting
2. Abnormity detection method
◆
Check if the operating
compression ratio of system is
below 1.8 before failure alarm;
◆
Check if the unit lack of
refrigerant.
◆
Check the four-way valve of
unit for normal switching and
free from backflow.
◆
Check if the detection value
of high/low pressure sensor is
correct.
◆
Check if the unit is beyond
the operation range.
3. Abnormity confirmation
conditions
Alarm to shut down if the ε<1.8
is detected for 5min during
normal operation (except start,
defrosting, oil return, residual,
shutdown)
4. Possible causes
◆
The detection value of high/
low pressure sensor is incorrect;
◆
The refrigerant in the system
is insufficient or the system is
with air leakage;
◆
The four-way valve cannot
be switched normally or with
backflow.
◆
The filter of compressor
suction pipe are blocked by
foreign matters;
The power module cannot
drive the compressor operating
normally;
◆
The inverter compressor is
with serious inter deterioration,
which makes it difficult to form
difference between high and low
pressure.
◆
The operation environment is
beyond the allowed range.
C h e c k i f t h e o p e r a t i n g
compression ratio of system is
below 1.8 before failure alarm.
Check if the refrigerant in the system
is with leakage or insufficient.
Check if the detection value of low
pressure sensor is correct.
Check if the four-way valve of
outdoor unit is with backflow
and if the suction pipe filter of
compressor is blocked.
Check if it operates normally after
replacing with a normal driver module.
Check if the allowed operation
range is exceeded.
Use the unit in accordance with
its allowed operation range.
Replace it correctly by after-
sales personnel on site and
ensure the refrigerant is enough.
Rectify it correctly by after-sales
personnel on site.
Check if the corresponding pressure
sensor is intersected with another
compressor, especially for a double
compressor system.
Troubleshoot and rectify it correctly
by after-sales personnel on site.
[Note]: Check if the suction pipe
filter of compressor is blocked,
when the discharging temperature
rises obviously.
R e p l a c e t h e d r i v e r m o d u l e
correctly.
Replace the inverter compressor
if the high-low pressure difference
cannot reach 0.4MPa above before
failure alarm.
Y
Y
Y
N
N
N
Y
N
Y
Y
N