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C
ONTROL
P
ROBLEMS
CONT
’
D
UGH017/0500
Series 1 Portable Chillers, PLC Control
T
ROUBLESHOOTING
6-7
Symptom
The control is lit and
there is no alarm
condition. The com-
pressor hums, but
does not run.
Possible cause
The input voltage is
incorrect
There is a phase loss.
Solution
Check the main supply volt-
age. It must be within 10% of
the nameplate rating.
❐
Check the fuses on the main
power supply. Replace or reset
as required.
❐
Check the phase-to-phase
voltages.
❐
Check phase continuity
through the compressor con-
tactor.
❐
Check the wiring at the
compressor.
Repair or replace any of these
as needed.