ULT Energy-saving Series
After-sales Service Manual
47
temperature in
the freezer
shutdown point
according to the customer's requirements, if not, reset the
temperature.
2. Refrigerant leakage
Check all welding points of machine compartment, find
out leakage points and repair welding. Refill refrigerant.
3. Temperature sensing probe is
out of order.
If the display board displays an abnormal code alarm, such
as E0/E1/E2/E3, it indicates the fault of temperature
sensing probe of the product. At the same time, check
whether the patch cord is normal, if it is normal, it means
that the temperature sensing wire is out of order, replace
the corresponding temperature sensing wire.
4. The capillary tube or system is
blocked by dirt or oil
Open the system to clean the capillary tube or replace the
filter.
5. High ambient temperature
In case of high ambient temperature, please add air
conditioning and reduce the room temperature.
6. Blockage of condenser
In case of dirty condenser alarm, please clean the filter
screen in time.
5. E0 alarm
When the input voltage of the
ambient temperature sensor is ≥
4.9 V, the sensor is open circuited;
when the input voltage of the
ambient temperature sensor is ≤
0.1 V, the sensor is short circuited.
1. Check whether the terminal of the ambient temperature
sensor is improperly connected or dropped, and whether
the sensor is damaged.
2. Check whether the sensor connector terminal on the
display board is loosened or poor contacted, and whether
the display board is damaged.
6. E1 alarm
When the input voltage of the
condenser sensor is ≥ 4.9 V, the
sensor is open circuited; when the
input voltage of the condenser
sensor is ≤ 0.1 V, the sensor is
short circuited.
1. Check whether the terminal of the ambient temperature
sensor is improperly connected or dropped, and whether
the sensor is damaged.
2. Check whether the sensor connector terminal on the
display board is loosened or poor contacted, and whether
the display board is damaged.
7. E2 alarm
When the input voltage of the main
sensor is ≥ 4.9 V, the sensor is
open circuited; when the input
voltage of the main sensor is ≤ 0.1
V, the sensor is short circuited.
1. Check whether the terminal of the main sensor is
improperly connected or dropped, and whether the sensor
is damaged.
2. Check whether the sensor connector terminal on the
main control board is loosened or poor contacted, and
whether the main control board is damaged.
8. E3 alarm
When the input voltage of the heat
exchanger sensor is ≥ 4.9 V, the
sensor is open circuited; when the
input voltage of the heat exchanger
sensor is ≤ 0.1 V, the sensor is
short circuited.
1. Check whether the terminal of the heat exchanger sensor
is improperly connected or dropped, and whether the
sensor is damaged.
2. Check whether the sensor connector terminal on the
main control board is loosened or poor contacted, and
whether the display board is damaged.
3. Replace it with the spare sensor.
4. In case of "E3" alarm, long press the "Buzzer Cancel"
button for 5 seconds, "E3" alarm will disappear. One
minute after the startup of the high temperature stage
system, the low temperature stage system starts.
9. Dirty
condenser alarm
When the difference between the
condenser temperature detected by
the condenser probe and the
ambient temperature is lager than
or equal to 17°C (lasting for five
minutes), the alarm will occur.
1. Open the front grille and clean the filter screen
2. Check whether the condenser probe is too close to the
condenser outlet
3. Wrap the condenser probe with tape
10. Low battery
alarm
When the battery power is lower
than or equal to 10.5 V, the low
battery alarm will appear.
1. Check whether the battery is out of its service life.
2. Check whether the terminal on the battery switch is
well-connected or the switch is damaged.
3. Check whether the charging circuit is normal: after 5
minutes of strong current on the refrigerator, test whether
the battery terminal on the main control board has voltage
output, and the output voltage should be ≤ 5 V.
