Büchi Labortechnik AG
Help with faults | 10
Operation Manual Rotavapor® R-250 Pro
55/78
Error message
Possible cause
Solution
E28
Short circuit at the cooling
water temperature sensor.
u
Disconnect the cooling water
temperature sensor.
u
Start the instrument again.
u
Replace the cooling water
temperature sensor.
u
Contact BUCHI Customer
Service.
E31
The mechanical safety
switch is activated.
u
Switch off the instrument.
u
Wait until the heating bath
temperature is less than 40 °C.
u
Start the instrument again.
u
Refill heating transfer medium
to minimum level.
u
Reset overtemperature
protection. See Chapter 10.3
"Resetting the
overtemperature protection",
page 56
u
Contact BUCHI Customer
Service.
E32
Heating bath runs dry
Temperature >200 °C
u
Switch off the instrument.
u
Wait until the heating bath
temperature is less than 180
°C.
u
Refill heating transfer medium
to minimum level
u
Contact BUCHI Customer
Service.
E33
The actual to set value dif-
ference is more than 15 °C.
u
Press the
Aerate
button.
u
Check set value for plausibility
(e.g. set value less than
ambient temperature)
u
If necessary, wait for the
heating bath to cool down
sufficiently
u
Contact BUCHI Customer
Service.
E40
Voltage drop or power out-
age
u
Press the
Aerate
button.
u
Make sure that the power
supply meets the
specifications. See Chapter 3.5
"Technical data", page 17
u
