ULT Energy-saving Series
After-sales Service Manual
23
Alarm
Alarm
code
Status
Instruction
remote alarm
High temperature
alarm
E00
It displays that the temperature is
higher than or equal to the high
temperature alarm setting temperature
for over 1 minute.
The alarm light
flickers and
overtemperature
alarm light flickers.
Buzzer alarm + remote
alarm output
Low temperature
alarm
E01
It displays that the temperature is
lower than or equal to the low
temperature alarm setting temperature
for over 1 minute.
The alarm light
flickers and
overtemperature
alarm light flickers.
Buzzer alarm + remote
alarm output
Too high ambient
temperature
E02
Ambient temperature is higher than or
equal to 35℃ for 30s.
Alarm light flicker
/
Main sensor fault
E10
When the main sensor fails.
Alarm light flicker
Buzzer alarm
Ambient temperature
sensor fault
E11
When the ambient temperature sensor
fails.
Alarm light flicker
Buzzer alarm
Condenser sensor fault E12
When the condenser sensor fails.
Alarm light flicker
Buzzer alarm
Battery disconnection E20
When the battery switch is not on, or
the battery connecting line is loose.
Alarm light flicker
Buzzer alarm
Reverse battery
connection
E21
It is detected that the battery is
connected reversely and the signal is
low level.
Alarm light flicker
Long buzzer sound
alarm
Low battery
E22
Lead acid battery: When the battery is
connected, the battery voltage is less
than 10.5 V after charging for 24
hours.
Alarm light flicker
/
Lithium battery: When the battery is
connected, the battery voltage is less
than 9.0 V after charging for 24 hours.
Alarm light flicker
/
Power failure alarm
E30 When the refrigerator is powered off.
The alarm light and
the power indicator
light flicker
synchronously.
The buzzer alarm
sounds every 3s. The
display board does not
display the inner
temperature for 30s,
and displays it normally
for 5 seconds, which
appear alter
Remote alarm output
Door opening alarm
E40
The door opening signal is detected
for 5 minutes.
Alarm light flicker
Buzzer alarm + remote
alarm output
Dirty condenser alarm E50
When the condenser filter is blocked,
or when the condenser temperature is
too high due to too high ambient
temperature.
Alarm light flicker
Buzzer alarm
5.5 Probe resistance changes with temperature (probe type: NTC, which is mainly for ambient temperature
sensor, condensation temperature sensor, and heat exchanger sensor)
Temperatur
e (°C)
Resistanc
e
(KΩ)
Temperatur
e
(°C)
Resistanc
e
(KΩ)
Temperatur
e
(°C)
Resistanc
e
(KΩ)
Temperatur
e
(°C)
Resistanc
e
(KΩ)
-40
63.3
-19
17.8
2
5.8
23
2.1
-39
59.4
-18
16.8
3
5.5
24
2.0
-38
55.8
-17
15.9
4
5.2
25
1.9
-37
52.3
-16
15.0
5
5.0
26
1.8
-36
49.2
-15
14.2
6
4.7
27
1.8
-35
46.2
-14
13.4
7
4.5
28
1.7
-34
43.4
-13
12.7
8
4.3
29
1.6
-33
40.8
-12
12.0
9
4.1
30
1.5
