Anaerobic chamber help please
 

We have a Forma Scientific anaerobic chamber that suddenly started malfunctioning after a gas tank change. The automatic cycle clicks on an continues for two cycles of vacuum and gas fill and stops midway through the last gas fill. I have checked for leaks,and can continue pressurizing the chamber through the manual override, but the auto cycle will not work. Any ideas on what I can do to fix this?
Thanks.

Re: Anaerobic chamber help please
 

Why ask here? Call Forma.