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MECHANICAL
CONDITIONS
CONT’D
UGH016/0500 Series 1 Portable Chillers, TIC Control
TROUBLESHOOTING 6-9
Alarm
Pump Overload
(pump and compres-
sor are off)
Possible cause
Overload set incorrectly.
Low supply voltage.
Faulty contactor
Faulty overload module.
Solution
Check table on wiring diagram
for correct amperage. Adjust
overload accordingly.
❏ Check supply voltage.
Supply voltage to contactor
should be +- 10% of name-
plate voltage.
❏ Check wire terminations
and connections. Tighten if
loose.
Check line and load side of
contactor. It should be less
than 5 volt drop across the
contactor. If it is not, replace
the contactor. See Replacing
the Contactor in the
Troubleshooting section.
Check amp draw of circuit. If
it is under the rated setting,
replace the overload module.
See Replacing Overload
Modules, in the
Troubleshooting section.