Armstrong sx 90 ultra furnace draft inducer is filling up with water. I'm assuming the air is not getting pushed out of the ductwork quick enough causing more condensation to back fill. Is the draft inducer going bad?
Nope, condensate drain clogged
I have an SX90. After a couple of years in our home, I noticed a splashing sound coming from the inducer blower. Long story short, it wasn't draining properly and was causing a vacuum failure, so the furnace would shut down right after the main blower kicked on, then recycle. The installer had connected a drain tube to a port at the 9:00 position. Gravity rules. There was an unopened port at 6:00, so I drilled it out, hooked up my own tube and it has been fine ever since. I think the problem is that the flue pipe dribbles just a little bit when the furnace is off. Most goes into the drain, but enough finds its way into the blower to cause problems.
I have the same problem. I flushed out all the condensate drains and they are clear. The blower is slowly filling with water and then eventually the pressure switch kicks out the furnace.
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