Good day, I just replaced the blower fan with a direct replacement and now the furnace is noisy when on high speed. 20 year old furnace
On mid-high it's perfect and sounds like it did before! I've tested the motor/blower when not attached to the furnace and it's quite and spins true. Almost seems like I now have too much air if that's possible.
I cleaned the fan and housing before putting it all back nothing is rubbing.
Normally I like to let the fan run 24/7 but it's just too noisy now. It's like a harmonic growl/hum/drone but easily heard. I'm thinking of just lowering the speeds and setting to mid/high and mid but I'm sure that's just a band-aid fix. I do seem to be getting more airflow now for what it's worth.
Any help would be appreciated as this is driving me nuts!!
Thanks in advance!!
On mid-high it's perfect and sounds like it did before! I've tested the motor/blower when not attached to the furnace and it's quite and spins true. Almost seems like I now have too much air if that's possible.
I cleaned the fan and housing before putting it all back nothing is rubbing.
Normally I like to let the fan run 24/7 but it's just too noisy now. It's like a harmonic growl/hum/drone but easily heard. I'm thinking of just lowering the speeds and setting to mid/high and mid but I'm sure that's just a band-aid fix. I do seem to be getting more airflow now for what it's worth.
Any help would be appreciated as this is driving me nuts!!
Thanks in advance!!
source https://hvac-talk.com/vbb/showthread.php?2222390-Noisy-on-high-Help-please&goto=newpost
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