2
6
25
25
Alarm
Code
Description
Possible Reason
Action
Reset
Refrigeration system error
E40
High pressure switch alarm
High pressure switch is open
The compressor will be tripped
Automatically when HP switch
closes
L40
High pressure switch lock
High pressure switch alarm happens
frequently
The compressor will be tripped
and the unit will be locked
Press “Start” >5 sec or manually
power-off and power-on
E41
Low pressure switch alarm
Low pressure switch is open
The compressor will be tripped
Automatically when LP switch
closes and time delay
E44
High discharge temperature
alarm
Discharge temperature is higher
than settings
The compressor will be tripped
Automatically when discharge
temperature is lower than set-
tings and time delay
L44
Higher discharge tempera-
ture lock
High discharge temperature alarm
happens frequently
The compressor will be tripped
and the unit will be locked
Press “Start” >5 sec or manually
power-off and power-on
E46
High condensing tempera-
ture alarm
Condensing temperature is higher
than settings
No
Automatically when condens
-
ing temperature is lower than
settings
E47
EXV Full-open warning
Less refrigerant charge or leakage
No
Automatically when EXV is not at
full-open
E48
Less injection warning
Less refrigerant charge or leakage
No
Automatically when PHE super
heat is smaller than settings
E50
High side liquid back
warning
Suction liquid back or injection too
much
No
Automatically when the differ
-
ence of discharge temperature
and condensing temperature is
higher than settings and time
delay
Misc. Error
E80
RTC warning
The time is configured for the new
controller
No
Automatically when finish time
configuration
E81
RTF warning
Communication error between MCU
and unit clock
No
Automatically when the commu
-
nication recovers
E82
Probe configuration error
alarm
The same probes are configured
No
Automatically when the probes
are configured correctly
E83
Digital inputs configuration
error alarm
The same digital inputs are config
-
ured
The related functions will be
disabled
Automatically when the digital
inputs are configured correctly
E84
Compressor configuration
error alarm
Digital compressor and solenoid
valve configuration does not match
The compressor will not work
Manually power off and power on
after the compressor configura
-
tion is right
E85
Injection probe configura
-
tion error alarm
EXV and injection configuration do
not match
EXV will not work
Automatically when injection
probe is configured correctly
L86
EEPROM R/W error lock
write/read error into EEPROM
The compressor will tripped and
the unit will be locked
Hold “start” button for 5s or
manual power off and on, alarm
will disappear when the com-
munication between MCU and
EEPROM is success.
