I have a small gas kiln, nothing like that. At some point I didnt use it for some time. Big surprise: clogged burner with a tiny piece of lint. One firing lost and learning how to get it working.
Also all the security sections should be looked at.
Before using a gas kiln after sometime one should desasemble the burners, use a vacum cleaner and reasemble. My car mechanic helped me the first time and we used a air pressure machine. If parts have to be replaced industrial ovens and hoobs companies sometimes have them.
Best luck Sofia