10 | Help with faults
Büchi Labortechnik AG
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Operation Manual Lyovapor™ L-300/L-300 Pro
10
Help with faults
10.1
Troubleshooting
Problem
Possible cause
Action
Compressor fails to
start or switches off
No power supply to compres-
sor
u
Check the power supply and
switch on the device.
Compressor overheated
u
Allow the compressor to
cool down.
u
Check ambient conditions.
Cooling tempera-
ture is not achieved
Wrong ambient conditions
Adjust ambient conditions. See
Installation site
Too much ice in the ice con-
denser
u
Defrost the ice condenser.
See Chapter 7.9.6 "Shutting
down the instrument",
page 76 for automatic
defrosting or Chapter 10.4
"Manually defrosting ice
condenser", page 105.
u
Fill up fresh water.
10.2
Faults, possible causes and remedies
Malfunction
Possible cause
Remedy
Instrument does not
work
Instrument is not connected to
the power supply.
u
Make sure that the power
supply is connected and
switched on.
Vacuum is not
achieved
Vacuum system is leaking.
u
Carry out a leak test (see
Performing a leak test).
u
Carry out a vacuum test (see
Chapter 9.2 "Performing a
vacuum test", page 98).
u
If necessary, replace tubing
and/or seals.
Vacuum pump is too weak.
u
Use a vacuum pump with a
performance of at least 9
m
3
/h.
u
Carry out maintenance work
according to the vacuum
pump manufacturer's
documentation.
u
Clean the filter at pump
outlet in a an ultrasonic
bath.
Drain valve is leaking.
u
Check whether closed drain
tube contracts. If it does,
contact BUCHI Service.