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Section VI Troubleshooting
Checklist
Unit will not start
Make sure the voltage of the power source meets the specified voltage,
±10%. Refer to the serial number label on the rear of the unit to identify the
specific electrical requirements of your unit.
Check the High Temperature/Low Liquid Level Safety. If the FAULT light is
on, make sure the fluid level in the bath is between the marks in the baffle
and the HIGH TEMP/LOW LEVEL SAFETY setting is greater than the fluid
temperature. Push the RESET switch, or, for units without reset switches,
turn the I/O switch off then back on, and attempt to restart.
Loss of cooling capacity
Be sure the cooling capacity of the unit has not been exceeded if circulating
to an external system.
When the unit is shut off, wait approximately five minutes before restarting.
This allows time for the refrigeration pressures to equalize. If the pressures
are not allowed to equalize, the compressor will short-cycle (clicking sound)
and no cooling will occur.
Proper ventilation is required for heat removal. Make sure ventilation
through the front and rear panels is not impeded and the panels are free of
dust and debris.
Ice build up on the cooling coils can act as insulation and lower the cooling
capacity. Raise the temperature of the bath to de-ice the cooling coil and
increase the concentration of non-freezing fluid.
No external circulation
Check for obstructions, kinks, or leaks in the circulation tubing.
Circulation will cease when the pump head has been exceeded.
No/poor temperature control
Check RS232/remote operation on or off.
Check remote sensor connection. Perform calibration.
Service Assistance and
Technical Support
If, after following these troubleshooting steps, your unit fails to operate
properly, contact our Customer Service Department for assistance (see
Preface, After-sale Support). In addition to arranging warranty service, our
Service Department can provide you with a wiring diagram and a complete list
of spare parts for your unit. Before calling, please obtain the following:
Part number
Serial number
