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Checklist
Thermo Scientific
Circulator will not start
Check the display for error codes, see Error Codes in this section.
Ensure the circuit protector(s) is in the on ( I ) position.
Make sure supply voltage is connected and matches the circulator's
nameplate rating ±10%.
No display
Recycle the circuit protector on the rear of the circulator.
Display reads 239°C
External temperature probe selected but no probe attached to circulator.
Attach external probe or select internal temperature sensor.
Circulator will not circulate process fluid
Check the reservoir level. Fill, if necessary.
Check the application for restrictions in the cooling lines.
The pump motor overloaded. The pump's internal overtemperature
overcurrent device will shut off the pump causing the flow to stop. This
can be caused by low fluid, debris in system, operating circulator in a
high ambient temperature condition or excessively confined space. Allow
time for the motor to cool down.
Ensure supply voltage matches the circulator's nameplate rating ±10%.
Inadequate temperature control
Verify the setpoint.
For refrigerated baths, ensure the condenser is free of dust and debris.
Check the fluid concentration.
Ensure circulator installation complies with the site requirements in
Section 3.
Ensure supply voltage matches the nameplate rating ±10%.
If the temperature continues to rise, ensure your application's heat load
does not exceed the rated specifications.
Enter the controller menu and ensure the ENERGY SAVER mode is on
in order for the system to maintain a stable temperature.
Check for high thermal gradients (e.g., the application load is being
turned on and off or rapidly changing).
Section 6 Troubleshooting
6-5
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