10 | Help with faults
Büchi Labortechnik AG
56/78
Operation Manual Rotavapor® R-250 Pro
Error message
Possible cause
Solution
E41
Load limit exceeded by ex-
ternal electrical consumers
(30 V).
u
Unplug the external consumer.
u
Replace external defective
consumer.
u
Contact BUCHI Customer
Service.
E42
Load limit exceeded by ex-
ternal electrical consumers
(24 V).
u
Unplug the external consumer.
u
Replace external defective
consumer.
u
Contact BUCHI Customer
Service.
E43
Electronic malfunction
u
Start the instrument again.
u
Contact BUCHI Customer
Service.
10.3
Resetting the overtemperature protection
u
Push the knob on the heating bath.
10.4
Replacing the inlet valve plunger
NOTE
Installing is done in reverse sequence.
u
Loosen the screws that attach the inlet valve
cover to the inlet valve.
u
Remove the inlet valve cover.
u
Remove the plunger.
