"micky" wrote in message

stuff snipped

How come the transformer failed at the same time I replaced the
nozzle? And the answer is almost obvious, even if it took me 2 days
to think of it. For the last several years, the furnace has probably
never run more than 20 minutes at a time, because I turn it on in the
fall when it's cold but not that cold out, and from then on the house
is 68 or 70.

Sounds like a candidate for an aux. muffin fan. I mount them on most
anything that runs very like stereos, dvr's, large-capacity battery chargers
or anything similar. It seems to have extended the life of a few pieces of
equipment that before fan cooling experienced capacitor failures and other
maladies on an all-too-regular basis.

If you know that your transformer overheats when running too long and that's
happened more than once, it needs some sort of cooling mechanism - perhaps
even the old heat sink from a PC CPU.

--
Bobby G.