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dontknowitall
I wonder if it's the hydraulic jack at the top of the air intake flap thingy? If there's no resistance to the flap when moving it, this could suggest it's at fault.
Only saying this as I had to replace on recently that was leaking. If it's not opening to let the air in, then the rest of the firing sequence won't work but the motor will run until lockout.
Re the control box, please someone correct me if I'm wrong, but I think you can test the connections on the control box to see if it's at fault, rather than just changing it and finding there was nothing wrong with the first one in any case.
Only saying this as I had to replace on recently that was leaking. If it's not opening to let the air in, then the rest of the firing sequence won't work but the motor will run until lockout.
Re the control box, please someone correct me if I'm wrong, but I think you can test the connections on the control box to see if it's at fault, rather than just changing it and finding there was nothing wrong with the first one in any case.