Hi Robert,
It turned out to be the contactor causing all the grief. Working perfect and quiet now. Even more so than when the home was new. Canada Customs however screwed me for duty and taxes etc making it an expensive part.
Thank you very much for your help..

Just ordered a new sequencer and a new capacitor. Sounds like noise is coming from sequencer after all. Will let you know when I get them.

Hi Robert, Seeing that we have changed the transformer do you think the prob could be the sequencer making the buzzing humming sound? I live on an island and in order to get a pro heating guy over here to check it out would cost a bundle. Maybe cheaper to get my local sparky to change a couple of pa...

Received the new transformer and had it installed but my furnace still makes the annoying humming/buzzing sound after it has been on heat for a while. Not too happy with Nordyne products

Transformer started humming again so I guess the spraying with lacquer is only a temporary solution. Ordered a new one from you this morn. Hope it gets here quick, Pretty cold in them thar hills.

Still a little warmer than Winnipeg though.

Thank you very much Robert. It appears it was the transformer making the noise. Sprayed it with a clear lacquer and now all is nice and quiet. Wishing you all a Very Happy New Year.

My Nordyne furnace has suddenly developed a loud buzzing noise when on heat. Sometimes it starts up and runs with normal fan sound only but after running for 5 or 10 minutes developes this loud buzzing noise. The home and furnace are not even 4 years old yet. It is kept very clean and has a new filt...