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DIY Home Repair Forum: HVAC 12-17-2010, 09:30 PM
Replies: 3
Views: 1,633
Posted By mstar
Thanks. since I have two db levels of hum I would...

Thanks. since I have two db levels of hum I would say one is abnormal.
I am assuming you are saying these can go a long time with a loud hum and still work.
Still it is annoying to hear it through...
DIY Home Repair Forum: HVAC 12-17-2010, 08:23 PM
Replies: 3
Views: 1,633
Posted By mstar
switching transformer hum normal?

I have an older furnance with a Honeywell RA 89a 1074 switching transformer that has a loud hum at times at other times a low hum
When I hear the loud hum the system still works and if I turn off...
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