8 Troubleshooting
57 K-439 Operation Manual, Version B
Malfunctions and their remedy
Malfunction Possible cause Remedy
System does not heat No voltage Insert mains plug, examine plug for
damage, check power switch
Mains switch is turned off Switch must light up green, when
system is powered up
Fuse has been activated Exchange fuse(s), see section 8.3
Heating elements are defective Contact Buchi customer service to
replace defective component(s)
Heating elements are overheated–
overtemperature safety switch is
activated
Contact Buchi customer service for
repair of defective component(s)
Fumes are escaping from the
suction module or its assemblies
into the fume hood
• Scrubber or water jet pump
not switched on or functioning
correctly
• Defective or clogged sealing,
glassware or tubes
• Stop the digestion process
• Check and clean all parts
• See manuals of the Scrubber / water
jet pump on how to increase
suction power
Malfunctions or errors which are not listed in the table are to be corrected by a Buchi trained technical
engineer who has access to the official service manuals. In this case, please refer to your local Buchi
customer service agent.
8.2 Diagnostics
The K-439 software enables the user to carry out a service test (OQ) and to view actors, sensors,
operating hours and unit information.
To open the Diagnostics menu select Main Menu > Diagnostics. The following screen appears:
8.2.1 Actors
This submenu enables the user to view the heating output of the heaters and the status of the
Scrubber B-414 and the backlight:
• Heaters: xx % xx °C
• Scrubber: On/Off
• Backlight: On/Off
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