LABEC H-DW-HW50 - Manual (Page 11)

5. After Sales Service
Some unexpected failures may arise during running. Please pay attention to the running status of
your ULT freezer. If any exceptional case arises, please check and solve it according to the following
introductions. If the problem is not solved well, please contact our service center for details.
Problem Possible Cause
ULT freezer does not
operate
l Power outage has occurred.
l The plug is bad or not securely plugged-in.
l Fuse is blown.
l Voltage is too low or too high.
Compressor does not
work
l Power in control panel is off.
l Temperature setting is wrong.
Temperature is higher
than setting
l Frost in inner wall is too thick
l The door is not closed properly or is opened too frequently.
l Overfull materials are put into chamber.
l Ambient temperature is too high.
Too great noise
l Freezer is not leveled well.
l Freezer leans upon the wall.
³ Below are normal operation conditions：
† There are some light clashes when the compressor starts up and stops.
† During wet season some frost may accumulate on the surfaces of cabinets. Please clean it with dry rag.
† DO NOT open the door twice within 5 miniatures. This may lead the hot air into the interior of freezer
and the door may be difficult to open because of a negative pressure due to a sharp decrease of
temperature of this part air.
† If the freezer has liquid flowing sound, the reason is the refrigerant flowing in the pipeline.
Notice: Before call the service engineer, Please clean and disinfect the freezer.
Condition: Cannot shake heavily, strike, preventing drenching.
Environment Temperature: -40ºc～+55ºc, Relative humidity: 10％～90％.