Whirlpool model nu40t61-403 loud hum:
by Del Price
I first wrote a post here that said I had got rid of loud hum by turning gas supply valve to 1/2 off to slow gas and that would solve problem.
Well it did for a day but error code kept appearing that burnner was dirty and would have to reset. Finally I called our local gas company to see our incoming gas pressure and all was good.
The tech then "bent the manifold tube" and eliminated the terrible hum!! Gone is hum, gas on full, no noise!! Hope this helps someone.