Julabo F12 - Troubleshooting

General safety recommendations and repair instructions
6
6.2. Troubleshooting
Disconnect the mains power plug before opening the unit!
When the overload protection device is triggered although the condenser is clean, or the
compressor does not start, check the electronics for possible damages before disassembling the
cooling machine.
Malfunction Possible cause Remedy
Compressor does not start 1) defect mains switch replace mains switch
2) cable interruption replace cable
3) no line voltage check fuses
Ventilator does not run  see 1)/ 2)/ 3) above
Compressor overheated  dirty condenser clean
 defect ventilator replace
No cooling  defect motor overload
protection device
replace
 too high volume of
refrigerant
pump out refrigerant
 defect ventilator replace
 defect compressor replace
 plugged capillary tubing clean (press)
 oil entered the refrigerant
circuit due to incorrect
storage
replace filter dryer, clean
capillary tubing (press)
 leaking cooling system
(soldering point or screw
connection)
detect leak under pressure
(using nitrogen) and close
leak