Troubleshooting - Thermo Scientific Lindberg/Blue M VO Series Installation And Operating Manual

8 Troubleshooting

WARNING! Troubleshooting procedures involve working with high voltages which can cause injury or death.
Troubleshooting should only be petformed by trained personnel.
This section i s a guide to troubleshooting oven problems. Refer to Table 6 for troubleshooting procedures.
Table 6.
Problem
Oven shelves warp and discolor.
Door gasket comes off.
System ultimate pressure is high.
No vacuum in oven.
Pump stalls.
Long drying time.
Probable Causes
Oven temperature is above 260°C.
Gasket is damaged from high temperature
operation or from resin damage.
Oven is contaminated with high vapor
pressure material.
Pump oil is contaminated.
Leaks in vacuum piping or ports.
Vacuum pump seal is worn.
Discharge valve is worn.
Internal parts are worn.
Vacuum vent valve is opened.
Oven does not pump down properly due to
misaligned door.
Power to pump is off.
Use of extension cord results in insufficient
amperage.
Pump is damaged.
The discharge line is blocked.
No pump oil or lost viscosity (overheating).
The piping is too narrow.
oven is too large.
Solution
Do not operate the oven above 260%.
Clean oven to remove resin.
Clean the oven. Refer to Section 7.1 on page 13.
Change the oil. Use inlet vapor trap andlor gas ballast.
Check for leaks in vacuum line, oven port, door.
Replace shaft seal.
Replace valve.
Install new vanes.
Close vent valve.
Realign the door. Refer to Section 7.3 on page 13 for
realignment information.
Check the power switch and outlet.
Move the oven closer to power source and do not use extension
cord.
Return the pump to the factory for repair.
Change the demister and clear the blockage.
Change the oil.
Install piping the same size as the pump inlet.
Move the pump closer to the oven or use a larger pump.