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BÜCHI Vacuum Controller V-800/V-805
13 Maintenance
Malfunction Possible cause Remedy
No display No current to apparatus Turn mains switch on
Check mains connections
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 close Valve coil is dirty
Valve cable is not plugged in
No vacuum Tubing incorrec See Chapter 4, Installation
Incorrectly cabled See 5.1 Controls
Vacuum is not reached Back evaporation Rotavapor Empty receiving flask
Water pressure to water jet pump is Completely open water tap
too low
Auto distillation has ”abated” Manually decrease pressure until the distillation starts again, then, if so desired,
return to the automatic function.
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.). Decrease pressure manually until
the distillation starts again, then return to automatic function (V-805)
Rest moisture is too high after Control to end dryness by manually decreasing pressure of product
auto distillation
13.6 Troubleshooting
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