Heidolph LABOROTA 20 compact and safety - Manual (Page 110)

110
E
TROUBLESHOOTING
 Master switch won’t light when turning ON
check power cord
master switch broken (call service)
 Display: Act Vacuum “0000“
vacuum sensor broken or not connected
 Display: Act Vacuum won’t change during evacuation
vacuum valve connected with vacuum pressure sensor terminal

Display : Act Vapor “----“
temperature sensor not connected or broken
 Display: Act T auto “----“
T auto temperature sensor not connected or broken
 Display: Act Chiller “----“
Cooling water temperature sensor not connected or broken

Vacuum valve inoperative
vacuum pressure sensor not connected with valve terminal, or valve broken

Display: Act Vacuum (aerated) differs from atmospheric
altitude correction factor not integrated.
Calibrate vacuum pressure sensor.

Poor vacuum pressure
inspect gaskets and fittings
check ground fittings, coat with vacuum grease, as required
PTFE seal installed the wrong way. Sealing lip needs to point towards drive head
check line to vacuum pump
 Heating bath lift won’t travel up
float switch not connected or broken
also refer to safety functions section
lift mechanism broken
upper limit switch broken
 Heating bath lift won’t travel down
lift mechanism broken
lower limit switch broken

No rotation
also refer to safety functions section
motor broken
 Mode won’t change from P const to T auto.
T auto temperature sensor not connected or broken
 Aerating valve won’t work. Aerating valve broken or not connected.

Distillation automatically discontinued (by accident)
EndP value incorrect; Set Time incorrect, cut-out sensor responded.
Also refer to safety functions (page 95)
Whenever facing a problem that cannot be fixed by the above information, call your authorized
Heidolph Instruments dealer right away.