JULABO FPW50-ME Refrigerated and Heating Circulators - Manual (Page 56)

Troubleshooting guide / error messages
56
Error message with ticker:
>SENSOR DIFFERENCE ALARM-CHECK VISCOSITY AND PUMP STAGE<
Defect of working or excess temperature protector.
Working temperature sensor and excess temperature protector report a
temperature difference of more than 35 K.
Error message with ticker:
> INTERNAL HARDWARE ERROR-CALL SERVICE <
Other errors
Error in A/D converter
Error message with ticker:
> EXCESS TEMPERATURE PROTECTOR ALARM-CHECK ADJUSTMENT <
Excess temperature protector defect.
The protection temperature is below the set working temperature setpoint.
Set the protection temperature to a higher value.
Error message with ticker:
> EXTERNAL SENSOR ALARM-CHECK EXTERNAL SENSOR <
External control was set but the Pt100 external senor was not connected or is
defect.
Error message with ticker:
> CLEAN CONDENSER OR CHECK COOLING WATER <
Insufficient cooling of condenser. Clean the air-cooled condenser. Check the
flow and the temperature of the cooling water of a water-cooled condenser.
Error message with ticker:
> COMPRESSOR FAILURE-CHECK REFRIGERATOR <
Stage 1 of the compressors does not work.
Automatic restart after short cool-down, message E 21 goes off.
Stage 2 of the compressor does not work.
Cooling machine – overload protection
The driving motor of the cooling compressor is equipped with an overload
protection which is triggered by increased internal temperatures or excessive
current consumption.
Shutdown can be caused by
- insufficient ventilation,
- insufficient wall distance,
- soiled condenser,
- high room temperature
- switching off and on in short sequence
Excess temperature in stage 1 of the compressor.
Excess temperature in stage 2 of the compressor.
Short circuit of control line to cooling machine during self-test.