First time poster here - this seems like a helpful community and I wanted
to get your opinion on a problem we're having with our furnace.
I had an Amana CCA36FDC installed about 8 years ago, along with a new
AC system as well. Last year towards the end of the heating season the
ignitor went bad twice in about 2 months. The 2nd time it was replaced
the technician noticed that water had gotten inside as the jets had some
rust on them. The hose from the humidifier had become clogged earlier
that year and some water had leaked down the side of the furnace - so we
assumed that was what caused the rust.
This year I went turn on the heat for the first time and it wouldn't light.
Only the jets nearest the ignitor would burn and thus the thing would
shut down after a few seconds. The technician notices that there's more
rust and says there's condensation leaking back down the flue. I never
actually saw it happening but after 2 weeks of checking several times a
day, I managed to see some water dripping back one morning after a cold
night (as the chimney warmed up in the sun, I surmised). The proposed
solution is a new chimney liner with the theory that the existing one has
buckled or has otherwise become damaged in such a way that condensation
will form on occasion and will continue to drip into my furnace unless it
is replaced. I have had the chimney exterior inspected to confirm that
there isn't any deterioration or another explanation for water getting in.
So we have water damage inside the furnace. The tech got it working
again by cleaning the rust off the jets but a new issue has cropped up.
It will work for a while and then at some point it will refuse to turn on.
The control board LED blinks eight times, which the tech says is the code
for "bad ignitor ground" (my paraphrasing). He was going to replace the
ignitor again, but didn't have one. We left it turned off last night (the
power to the furnace itself was turned off) and this morning I turned it
back on just to see if it would come on - and it did. It ran from about 8am
until 1pm or so and then it stopped with the LED blinking 8 times again.
The code seems to be incorrect as the ignitor is working. Could it mean
something else - or perhaps has the control panel or some other part
been damaged such that the wrong code is being generated?
Any opinions on the water issue and the proposed solution would also
be greatly appreciated.