Version Nr. 1-11 - 05.10.2022
Doc. No. 9985409576
21 / 24
15. Trouble shooting
Failure
Condition
Cause
Solution
Unit
doesn't
cool
Internal fan does not work
Power not connected.
Verify power supply
Internal fan works, external fan
and compressor don't work
Enclosure temperature is below
setting temperature (St1)
Verify values of parameter
"St1"
Door switch contact is open
Verify door switch
Controller doesn't work
Replace controller
Internal fan works, external fan
and compressor don't work.
Display shows alternating OFF
and temperature
The sequence of the phases
inside the power supply
connector is incorrect
Change phases inside power
supply connector
External and internal fan work,
compressor does not work
Compressor motor electrical
failure
Have compressor replaced
by qualified service technician
Capacitor for compressor failed Replace capacitor
Compressor works, external fan
doesn't work
External fan needs to be
replaced
Replace external fan
Enclosure
temperature
too high
Compressor and fans (external
and internal) work all the time
Cooling unit undersized
Enclosure needs a cooling
unit with with higher capacity
Compressor and external fan
work in alternating mode
(ON / OFF)
Thermal compressor protector
triggered
Verify if ambient temperature
is too high,clean condenser
Refrigerant leakage
Contact dealer/service center
Excessive
condensate
Enclosure door open
Ambient air gets into the
enclosure
Ensure door is closed, add
a door switch and connect
it to controller
Enclosure door closed
Enclosure IP protection class
is below IP54
Seal all openings of the
enclosure
Damaged or misplaced sealing
strip
Repair sealing strip
accordingly
16. Maintenance & Cleaning
Always switch power supply off before starting any maintenance on the unit.
Wait for 5 minutes for electrical components to discharge.
The cooling unit is generally maintenance free and can be operated without filters in most environments.
If the ambient air is extremely dusty, we recommend installing filter mats (see accessories). These should be
cleaned or replaced at regular intervals. Oily or greasy filter mats should be replaced immediately. Do not use a
steam jet or high pressure to clean the filter mats. Do not wring out the filter mats.If the ambient air is
extremely oily, we recommend the use of metal filters (see accessories). They can be cleaned with standard
cleaning agents and reused. In addition the unit should have regular functional tests (approx. every 2,000 hours
depending on the grade of ambient pollution).
Note: The use of filter mats / metal filters reduces the cooling capacity of the unit..
Disposal
The cooling unit contains R134a refrigerant and small quantities of lubricating oil. Replacement, repairs and
final disposal must be done according to the regulations of each country for these substances.
