Whirlpool model nu40t61-403 loud hum:

by Del Price
(Antioch, Ca.)

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.

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Jul 14, 2014
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by: Anonymous

Your question referee to "what is meant by bending the manifold tube?" Answer is the manifold tube is the flexable metal line at the lower front of the water heater that goes from the control module (box with control knob and flashing light), to the burner assembly. (The unit in the bottom of the water heater that ignites when the control unit tells it to heat up the water when needed.) So, you have a solid tube and a flex tube coming out of the bottom of the control unit. Bend the "flex" line to be as close to the solid tube as you can. When you do you will have a pronounced bend in the bottom. Do not touch the solid line. This is a touchy thing to do and you have to play around to get the exact bend to get rid of the hum. It should not have to be this way and I almost didn't get it to work. Engineer needs his ass kicked. All these units should be recalled and whirlpool should pay to have them fixed and or returned. They are a sham! Piece of crap!!
May 07, 2014
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by: Anonymous

Im having the same issue. What do you mean by (bent the manfold tube)?

Thank you for your help on this

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