Airwell AWAU-YDV1010-H13, Service Manual

Page: 158 / 187

156
Failure code
Outdoor
digital
display tube:
78-0, 1
Indoor wired
controller:
4E
Indoor unit LED status
LED5 Failure description:
Cooling/heating lack of refrigerant alarm
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
◆
When the unit stops,
confirm if the corresponding
temperature upon saturated
equilibrium pressure is lower
than the outdoor or indoor
temperature, whichever is
lower;
◆
Check the unit parts for
leakage.
◆
Check if the detection value
of low pressure sensor is
correct.
3. Abnormity confirmation
conditions
Ps<0.1Mpa runs continually
for 30 minutes upon operation
of cooling compressor; Ts1-
ET>20& Ts1-ET>20°C LEV
runs fully-open for 60 minutes
upon operation of heating
compressor.
4. Possible causes
◆
The refrigerant in the system
is insufficient or the leakage
parts are found;
◆
The detection value of low
pressure sensor is incorrect;
◆
The allowed operation range
is exceeded.
Check the system for refrigerant
leakage or insufficiency
Check if the detection value
of low pressure sensor is
correct.
Check if the allowed operation
range is exceeded.
Use the units in accordance
with the allowed operation
range.
Rectify on site by after-sales
personnel.
Rectify on site and ensure
sufficient refrigerant by after-
sales personnel.
Y
Y
Y
N
N