From what you're saying, the unit's defective and should be repaired or
replaced properly. Given the previous pyrotechnics, I'd wager that
warranty coverage could still be argued. You might want to contact your
lawyer on that one if dealer/mfg. drag feet.

More'n likely some local media outlet would be interested in the story
if it gets tossed back to you.

Inquiring minds have to ask- what were they thinking, with electronic
controls, circuit-boards, and such? Especially ones that could put the
unit into self-cleaning mode. IMHO, that is in itself defective.

Sure you don't want gas?

J