30
BÜCHI
Rotavapor
R-200/205
5.9
Troubleshooting
Malfunction
Possible cause
Remedy
Apparatus does not work
Main switch is off
Turn mains switch on
Apparatus is not connected
to the mains supply
Check mains connections
Bath does not warm up
Main switch is off
Turn mains switch on
Apparatus is not connected
to the mains supply
Check mains connections
Over-temperature protection reacts
Automatic reset after cooling
Internal fuse is defect (only 230V)
Call customer service
Servo lift without function
Various causes
Call customer service
Flask does not rotate
Rotary knob is set to 0
Turn rotary knob clockwise, until rotation
starts
Apparatus has been
Turn rotary knob to ”0” and then turn it
switched on again
clockwise, until rotation starts
System is not tight
Joints have not been greased
Grease joints
Hose nipples have not be screwed
Check hose nipples
correctly or they are defect
Tubes are untight (brittle)
Replace tubes
Sealing system has been installed
Check sealing system
incorrectly
Seal is defect
Replace seals
Frequent switching of valve or pump
System is untight
Control all sealing points
(tubes and their connections)
Hysteresis is too small
Choose larger hysteresis
(if end vacuum is greater than
700 mbar, set to automatic hysteresis)
Valve does not switch
Valve does not shut off
• Valve is dirty
• Valve cable is not plugged in
Vacuum is not reached
Back evaporation Rotavapor
Drain receiving flask
Water pressure of water jet
Open water tap completely
pump is too low
Distillation has ”abated”
Manually sink pressure until the distillation starts again
Distillation has ended
a)
Back evaporation from the receiving flask is too strong (especially
despite not dried out completely
solvent mixtures), drain receiving flask and start distillation again
b)
Malfunction in distillation procedure is not exactly defined (for example,
sudden cooling, heat flow is too low, etc.)
Display E1
Actual temperature was >3°C above
AUTO RESET after cooling off, upon
the target value when heating was
second occurrence; Call customer service
turned on
Table 6: Troubleshooting
5 Operation
