Troubleshooting guide / Error messages
48
• Defect of the working or excess temperature sensor.
Working temperature and excess temperature sensors report a
temperature difference of more than 25 °C.
• Other errors (I
2
C-BUS errors)
• Error in A/D converter
• Excess temperature sensors defect.
• The excess temperature value lies below the working
temperature setpoint. Set the excess temperature to a higher
value.
• 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.
After a short cooling interval, the compressor motor will be
automatically reconnected and the message "CODE 21" no
longer appears.
• 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 in stage 1 of the compressor.
• Excess temperature in stage 2 of the compressor.
• Short-circuit in the control cable for the refrigerating machine
during self-test.
• Cable of the excess temperature sensor interrupted or short-
circuited.
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