BUCHI Extraction Unit E-816 HE - Manual (Page 47)

8 Troubleshooting
47 E-812/816 Hot Extraction Operation Manual, Version B
8 Troubleshooting
This chapter helps to resume operation after a minor problem has occurred with the instrument. It lists
possible occurrences, their probable cause and suggests how to remedy the problem.
The troubleshooting table below lists possible malfunctions and errors of the instrument. The operator
is enabled to correct some of those problems or errors by him/herself. For this, appropriate corrective
measures are listed in the column “Corrective measure”.
The elimination of more complicated malfunctions or errors is usually performed by a BUCHI technical
engineer who has access to the official service manuals. In this case, please refer to your local BUCHI
customer service agent.
8 .1 Malfunctions and their remedy
Table 8-1: General malfunctions and their remedy
Malfunction Possible cause Corrective measure
Instrument does not work Incorrect or no mains connection Connect the instrument correctly to the mains
supply
Instrument not switched on Switch on the instrument
Method cannot be started Service mode active Change to Extraction mode
Rack is in upper position Lower the rack
Solvent tank is full Empty the tank
Protective shield is open Close the protective shield
Software does not show the main
screen Go back to the main screen
Method stops Cooling water flow is too low Check the cooling water connection and all
hoses for bends and remove them, if neces-
sary
Cooling water sensor is defec-
tive (may be the feeding water is
contaminated with algae, lime, etc.) Contact the BUCHI customer service
Evaporation of extraction
solvent Seals wrong, deformed or damaged Exchange the seals
Spring deflection downwards Contact the BUCHI customer service
Incorrect positioning of the beaker/
glassware and seals Contact the BUCHI customer service
Boiling retardation Incorrect positioning of the beaker Place the beaker directly onto the heating
plate
No anti-bumping granules were used Put anti-bumping granules into the beakers
Too long waiting time between
preparation of the instrument and
start
Start the instrument quickly after solvent was
added