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Section 9 – Troubleshooting
CAUTION: Risk of electrical shock! Disconnect switch required to de-energize the equipment
before servicing.
The following troubleshooting guide is based on standard OPTI TEMP units. For custom
units, please refer to the Appendix for additional instruction sheets.
MANUFACTURER NOTE:
If the chiller’s process fluid temperature is 5 degrees colder than the controller’s fluid set
point, the Opti Temp chillers are programmed to shut off the compressor until the process
fluid temperature warms up to the desired process fluid set point. In addition, a “freeze
alarm” light on the chiller front panel will illuminate showing a fluid temperature warning.
There is no need for any service at this time, but this light will act as a visual indication that
the chiller’s compressor is not operating.
Upon daily initial system start or fluid fills, it is common for the fluid temperature to be
significantly colder than the chiller’s controller set point. It will therefore be common for the
compressor to be “off” and the “freeze alarm” light to be illuminated until the process fluid
warms to the desired set point.
Once the process fluid temperature reaches the controller’s set point, the compressor will
once again start its operation and should run continually during normal chiller function.
If the compressor shuts off frequently or the “freeze alarm” light is continually being
illuminated, please call Opti Temp service to discuss the system’s operation. Opti Temp
service can be reached at (231)946-2931.
Problem Possible Cause Remedy
Compressor will not
start but pump is
running
Compressor failure Contact OPTI TEMP customer service
Temperature controller failure Replace if faulty
Compressor contactor Replace if faulty
Compressor overload
compressor contactor, wiring and
Freeze condition
Inspect the temperature control and
replace if faulty
Check pump flow and increase flow if
Hi or low refrigeration pressure See Hi or low refrigeration pressure
Compressor and pump
will not start
No incoming power
Check incoming power and
disconnect
Fuses Check fuse, replace if faulty
Fluid level drops below critical level Check for leaks and fill fluid reservoir
Pump will not start but
compressor is running
Pump failure Replace if faulty
Pump contactor Replace if faulty
Pump overload
Check voltage, amperage, pump
contactor, wiring and overload set-
Low refrigerant
pressure
Refrigeration pressure sensor
Check for proper range, replace if
faulty
Refrigerant leak
Contact refrigeration service
technician
Low refrigerant charge
Contact refrigeration service
technician
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