Symptom
Sequence Complete indicating light remains
on after the outer door is open.
Cause/Solution
Outer door switch is defective or needs adjusted.
Symptom
Gas system indicating light goes out during equalization.
Cause/Solution
Anaerobic gas cylinder is empty; there is a restriction in the line; mixed
gas pressure switch or solenoid is defective. Replace tank, or correct
restriction as needed. Pressure switch and solenoid replacement by quali-
fied technician only.
Symptom
Unit will not maintain anaerobic state.
Cause/Solution
Air leak in the transfer chamber, air leak in the glove chamber, or glove
chamber pressure too low (front should have a slight outward bulge).
Symptom
Interchange stuck in vacuum. Cannot open inner or outer
doors.
Cause/Solution
Relieve vacuum by turning manual purge knob CCW until chamber
relief bottle bubbles, then turn knob CW to close purge valve. Toggle
Nitrogen switch to Manual until gauge reads zero, then turn back to
Auto. Open doors.
Anaerobic System 5-7
Thermo Scientific
Section 5
Troubleshooting
General
Troubleshooting (cont.)