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Troubleshooting
Checklist
Unit will not start
On Digital Plus controllers, check Serial Communication Mode on or off.
Check reservoir. Unit will not start if the reservoir fluid is below the lower slit.
Check the line cord; ensure it is plugged in.
Check the position of the circuit breaker on the rear of the unit.
Check the controller for error codes, see previous page.
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.
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 Serial Communications Mode on or off.
Check controller PID values. See next page for factory preset values.
NOTE:
Using high viscosity fluids at low temperatures may require PID adjust-
ment, contact Thermo Fisher.
Perform internal temperature sensor calibration.
Check optional external sensor connection. Perform calibration.
High Temperature Cutout activated, see page 28.
Condensation
A gasket is available for EX 7 units to install under the controller in order to
prevent any condensation from leaking into the unit.
Part Numbers:
Gasket, Baffle
084900
Clamp
036198
Instructions
U00922
No serial communications
All units are tested for serial communications before they leave the factory.
Ensure the Computer indicator on the controller is on.
Check all communications settings and commands, they
must be exact
. See
Appendix B.
Check all wiring for proper connections or possible shorts.
Software to verify serial communication is available from Thermo Fisher.
