[I]Hello All, We have a Payne a two stage high efficiency furnace (Model: pg9mxa..). I was able to fix the noise problem by replacing the inducer assembly (thanks to this forum members, Ebay seller and other resources) on my third trial (I accidentally purchased a single stage one and had to short the wiring on control board to make it works on high stage until the end of last winter). Now I compared the defective assembly with a working single stage one and noticed the motor shaft if moving back and fort few millimeters (1/10"?) on defective unit. My understanding is that this loosened shaft is the root cause and it allows draft inducer blower wheel (Carrier/Bryant/Payne 319828-701) move forward to hit the ABS housing hence terrible noise. I tried to push the shaft back to make it firm yet it looks it does not help and the gap stay there. Is there a way to fix it? Is it something inside the motor housing or around cooler fan? I'll check further to find if there is a spacer, washer, etc to keep the shaft back (which seems solve the problem), meanwhile any insight will help. Thank you in advance.[/I]

inducer motor going on for a minute then off. i am only running the A/C so should not be on. has never done this before. furnace is Goodman GMPN100-4 and about 18 years old. have not used it for heat very much as i burn wood