So the oven made a weird whooshing noise every now & again, but nothing we could pin down or duplicate to debug. Then it sort of stopped heating, even though the ignitor was glowing, and the kitchen smelled of unburned propane and hot plastic.
Emergency stop, shut off the gas valve, finish the chili and cornbread in the ‘waver and toaster oven, let ‘er cool down, dig out the repair parts manual from the file cabinet.
Dismantled the oven and found a weird encrustation on the burner tube. I wasn’t sure if the tube was supposed to have a dingus that meters the ignition gas at some known rate, but scratching at the lump made it look as though the tube simply burned through and corroded. The size of that hole would certainly make the gas whoosh a bit.
Note the soot lines. The heat shield over the tube had a soot smudge, too, which I think caused the “plastic” smell.
The replacement part from Sears is $80. It’s $50 from RepairClinic.com and they throw in the ignitor module that’s $70 from Sears. Judging from their picture the burner tube has three little holes that blow gas over the ignitor, no metal dingus. You can see the holes in the second picture.
So a new burner tube (and ignitor, which I’ll zip-tie to the back of the oven) is on order.
Update: of course the new ignitor doesn’t fit on the old tube, nor does the old ignitor fit on the new tube. And the connectors are completely different. Had to dig some ceramic wire nuts out of the parts stash; I knew I’d been saving them for some good reason.
Grrrr & similar remarks…