This unit is in a restaurant. The unit won't fire till I bypass the 2 wires that go up the left side of the unit. Must be a limit switch somewhere that is open. I was hoping to look at a diagram of the unit so I knew how to get to it. Also, I can feel hot air on the left side beside the glass. Does this mean the glass gasket is shot?- No, I did not leave anything bypassed. Looked at the Lennox site, I can't find the model number I'm looking for because they seem to be called names instead of models. Might be tough getting any parts if this unit is obsolete. Any info would be helpful.