CH1500, CH2000 & CH3000 Chiller Operator’s & Installation Manual
Publication Number: 621055837OPR - 12 - © 2010-2014, Cornelius Inc.
TROUBLESHOOTING
IMPORTANT: Only qualified personnel should service internal components or electrical wiring.
Disconnect power to the unit before servicing. Follow all lock out/tag out procedures established by the user. Verify all
power is off to the unit before performing any work.
Failure to comply could result in serious injury, death or damage to the equipment.
Trouble Probable Cause Remedy
Chiller does not operate, Control
Power Light OFF.
A. Control Power Switch “OFF”.
B. No power.
C. Defective power supply connection.
D. Defective Control Power Switch
E. Defective Control Transformer
A. Turn the Control Power Switch to the
“ON” position.
B. Check the fuse or circuit breaker.
C. Check wiring and correct loose or
poor connections.
D. Replace the switch.
E. Replace the transformer.
Pump does not operate. Pump
power light “OFF”.
A. Pump power switch “OFF”.
B. Defective pump power switch.
C. Defective control transformer.
A. Turn the pump power switch to the
“ON” position.
B. Replace the switch.
C. Replace the transformer.
Pump does not operate. Pump
power light “ON”.
A. No water in reservoir.
B. Restriction in the line to or from the
chiller.
C. Open or defective pump overload
relay.
D. Defective pump contactor.
E. Defective pump motor or damaged
impeller.
A. Fill reservoir.
B. Remove restriction.
C. Manually reset the relay or replace if
necessary and check amp setting on
overload.
D. Replace the pump contactor.
E. Replace the pump or impeller.
Chiller does not cool. Cooling
light “OFF”
A. Defective thermostat A. Replace thermostat
Chiller does not operate. Cool-
ing light “ON”. (low pressure
alarm light cycles on/off)
A. Process water too cold
B. Low process water flow.
C. Defective expansion valve.
D. Refrigerant loss.
E. Water bypass valve failed.
F. Defective pump.
A. Increase the thermostat setting.
B. Ensure that there is adequate flow
through the process piping.
C. Replace the expansion valve.
D. Check the sight glass. If bubbles are
seen flowing through it, the chiller
needs to be leak tested and
recharged with refrigerant.
E. Consult technical service depart-
ment.
F. Replace pump.
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