Troubleshooting guide / Error messages
26
Warnings without a complete shutdown of the unit: E 21 to E 24
• Cooling of the condenser is affected. Clean air-cooled condenser.
Check the flow rate and cooling water temperature on water-cooled
condenser.
• Compressor stage 1 does not work.
• Compressor stage 2 does not work.
Cooling compressor overload protection
The motor of the cooling compressor is equipped with an overload
protector, which will be activated by excessive temperature in the capsule
or by excessive current consumption.
Causes for motor disconnection:
- poor air circulation
- small distance to walls
- dirt accumulated on condenser
- high ambient temperature
- switch-off and on for short intervals
• Excess temperature on compressor stage 1.
• Excess temperature on compressor stage 2.
This message appears every 10 seconds as long as the compressor is not
switched on although requested by the circulator.
After a short cooling interval, the motor will be automatically
reconnected and the message "E xx" no longer appears.
• Control cable of the refrigerated circulator short-circuited during self-test.
⇒
Press enter
to quit the audible signal.
After eliminating the malfunction, press the mains power switch off and on
again to cancel the alarm state.
If the unit cannot be returned to operation, contact an authorized JULABO
service station.
• Special message "Configuration Error"
The configuration of the circulator does not conform to its present use.
• Press enter to automatically perform a single modification of the
configuration.
Then contact an authorized JULABO service station.
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