LABEC DW-FL270 - Manual (Page 7)

An independent temperature checks of temperature in the chamber and the displayed
temperature on the Temperature Controller should be carried out.
All alarms should be tested.
5 Trouble Shooting and After Sales Service
Some unexpected failures may arise during running. Please pay attention to the running status
of your ULT freezer. If any problems arise, please check and solve it according to the following
trouble shooting list. If the problem is not solved by any of these, please contact our Service
Department with the serial number of the unit.
Before a Service Visit, please clean and disinfect the freezer.
Problem Possible Cause
ULT freezer does not
operate
Power outage has occurred.
The plug is faulty or not securely plugged-in.
Fuse is blown.
Voltage is too low or too high.
Compressor does not
work
Power in control panel is off.
Temperature setting is wrong.
Temperature is higher
than setting
Frost in inner wall is too thick
The door is not closed properly or is opened too frequently.
Chamber is overloaded with product.
Ambient temperature is too high.
Loud Noises Freezer is not level.
Freezer coming into contact with wall or object.
Below are within normal operation parameters:
There are some light clashing noises when the compressor starts up and stops.
During rain and high humidity some frost may accumulate on the surfaces of cabinets. Please
wipe away with dry rag.
DO NOT open the door twice within 5 minutes. This may cause the door to be difficult to open
due to negative pressure, caused by hot air let in by opening door contracting.