Technical data

Check the internal fuse 202F3.
6.4. Heating unit is not activated
Please note that during the main drying phase and during the final
drying phase the heating unit is not activated until the preset safety
pressure is reached.
If the heating unit is not activated even though the pressure is
below the safety pressure, please check the fuse 202F1.
6.5. Fan (ice condenser chamber) is not activated
Check the precision connection in the ice condenser chamber.
Check the internal fuse 202F2.
Internal fuses
The internal fuses 202F1, 202F2 und 202F3 are located behind
the left side panel. Switch the unit off and disconnect the mains
plug. Remove the left side panel of the unit.
6.6. Insufficient ice condenser temperature or shelf
temperature
The refrigeration unit is equipped with a protective device against
overpressure in the refrigeration system and with a thermal motor
protection switch.
The protective devices trip
when the ambient temperature is too high,
when the air circulation of the heat exchanger of the
refrigeration system is insufficient,
when the refrigeration system is overloaded.
Operating Manual Freeze Dryer ALPHA 1-4 LSC / ALPHA 2-4 LSC Troubleshooting • 75