Danfoss ERC 112D VSC, User Manual, Page: 25 / 30

Troubleshooting
Problem Probable cause Remedy
Compressor does not start Faulty frequency table
Wrong / loose connection of frequency cable Check the frequency cable continuity.
Check the connection of frequency cable at
controller and drive side
Fan does not start Door is open or door contact is defective Fan stops when door is opened
Check that door contact is ok
Defrost does not start Controller in pull down mode Defrost might be delayed during pull down
Check parameter Pud->Pdi
Alarm does not sound Alarm delayed Check ALA->Htd, Abd
Check Pud->Pdd
Display brightness is weak Ambient light sensor broken Replace sensor
Shift between ECO and normal mode does not
happen on ambient light change
Ambient light sensor broken
or light level not set properly Check Eng->SLd, SLn
Display alternates between condenser and
temperature Condenser too hot Clean condenser
Check Con ->CAL, CbL
Display alternates between high and
temperature Temperature too high Check ALA->HAt
Display alternates between low and
temperature Temperature too low Check ALA -> LAt
Display shows " dEf " Defrost in progress Check diS ->SdF
Alarm
code Trigger Automatic
clearance Outputs Comments
"Hi" Air temperature is higher than
"
ALA->Hat " for " ALA->Htd "
User configured Blink " Hi " with the highest temperature; If configured:
cut in alarm relay, beep the buzzer
High temperature alarm
"Lo" Air temperature is lower than
"
LAt " for " Ltd "
User configured Blink " Lo " with the lowest temperature. If configured:
cut in alarm relay, beep the buzzer
Low temperature alarm
"Con"
Condenser temperature is too
high or too low User configured Blink " Con ". If configured: cut in alarm relay, beep the buzzer Condenser alarm
"dor" Door open for more than
"
ALA -> dod
"
Always Blink " dor ". If configured: cut in alarm relay, beep the buzzer Door open alarm
"uHi" Line voltage is higher than
"
Cop->uHi "
Always Blink "
uHi
". If configured: cut in alarm relay, beep the buzzer High voltage alarm
"uLi" Line voltage is lower than
"
Cop->uLi "
Always Blink " uLo ". If configured: cut in alarm relay, beep the buzzer. Low voltage alarm
"LEA" Compressor continuous
running for more than
"
ALA->LEA "
Always Blink " LEA ". If configured: cut in alarm relay, beep the buzzer Leakage alarm
"E01" " S1 " error Always Blink " E01 ". If configured: cut in alarm relay, beep the buzzer " S1 " sensor failure
(short or open)
"E02" "
S2
" error Always Blink "
E02
". If configured: cut in alarm relay, beep the buzzer "
S2
" sensor failure
(short or open)
"E03" " S3 " error Always Blink " E03 ". If configured: cut in alarm relay, beep the buzzer " S3 " sensor failure
(short or open)
User Guide | ERC 112D VSC Refrigeration Controller
© Danfoss | DCS (vt) | 2019.07 BC286552322855en-000201 | 25