Condition Fault Remedy
1 Pressure dewpoint too high Air inlet temperature too high Check and correct; if necessary, clean
the aftercooler of the compressor
Ambient temperature too high Check and correct; if necessary, draw
cooling air via a duct from a cooler
place or relocate the compressor
Shortage of refrigerant Have circuit checked for leaks and
recharged
Refrigerant compressor (M1)
does not run
See 3
Evaporator pressure too high See 5
Condenser pressure too high See 2
2 Condenser pressure too high
or too low
Fan control switch out of order Replace
Fan blades or fan motor out of
order
Check fan/fan motor
Ambient temperature too high Check and correct; if necessary, draw
cooling air via a duct from a cooler
place or relocate the compressor
Condenser externally clogged Clean condenser
3 Compressor stops or does not
start
Electric power supply to
compressor is interrupted
Check and correct as necessary
Thermal protection of
refrigerant compressor motor
has tripped
Motor will restart when motor windings
have cooled down
4 Electronic condensate drain
remains inoperative
Electronic drain system
clogged
Have system inspected
Clean the filter of the automatic drain
by opening the manual drain valve.
Check functioning of the drain by
pushing the test button.
Condensate trap continuously
discharges air and water
Automatic drain out of order Have system checked. If necessary,
replace the automatic drain.
5 Evaporator pressure is too high
or too low at unload
Hot gas bypass valve
incorrectly set or out of order
Have hot gas bypass valve adjusted
Condenser pressure too high
or too low
See 2
Shortage of refrigerant Have circuit checked for leaks and
recharged
Instruction book
158 2920 7090 51
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