FP51-SL
79
Defect of the working or excess temperature sensor.
The working temperature and excess temperature sensors report a
temperature difference of more than 35 K.
Other errors (I
2
C-BUS errors)
Error in A/D converter
Excess temperature sensor is defective.
The safety temperature is below the working temperature setpoint. Set the
safety temperature to a higher value.
External control selected, but external Pt100 sensor is not connected or is
defective.
Cooling of the condenser is impaired. Clean the air-cooled condenser.
For a water-cooled condenser, check the flow rate and temperature of the
cooling water.
The first-stage compressor does not work.
After a short cooling interval, the compressor motor will be automatically
reconnected and the message “CODE 21” will no longer appear.
The second-stage compressor does not work.
Cooling compressor overload protection
The motor of the cooling compressor is equipped with an overload protector,
which will be activated in case of excessive temperature in the capsule or
excessive current draw.
Causes of motor shut-off:
- poor air circulation
- short distance to walls
- dirt accumulated on condenser
- high ambient temperature
- compressor switched off and on at short intervals
Excess temperature in the first-stage compressor.
Excess temperature in the second-stage compressor.
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