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 Pressure switch chatter
Author: dadracer (PA)

Hey guys,

I have just replaced my pump and am having problems with the pressure switch chattering once it reaches pressure. I have checked the pressure in the bladder and it is 2psi below the pumps cut it pressure. The old pump startied doing the same thing and finally gave up.

My system is as follows - I have a well pump delivering water to storage tank where it is mixed with a very mild bleach solution. There is a new 3/4 hp pump pushing the water from the tank into a pressure vessel (bladder) then up to the house. Its all 1-1/4 pvc pipe.

Any idea why the pumps pressure switch is chattering so bad? The pump is frequently cutting out (probably due to the thermal cutoff)

Any advise would be appreciated.

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 Re: Pressure switch chatter
Author: North Carolina Plumber (NC)

I'd let a little air out of the tank first. Sometimes the pressure gauge is not calibrated correctly , and it be off just enough to cause the switch contacts to chatter.

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 Re: Pressure switch chatter
Author: dadracer (PA)

Hey, thanks for the reply!! I did just that, as well as changed the filter (which I replaced when installing the new pump) back to the same spec. (the previous filter was 6 micron I tried a 3 micron filter instead!) After doing the filter then bleeding some air out of the bladder it kinda worked.

It stopped the lengthy chatter down to just once ore twice before cutting off. I think if I adjust it further I can get it to stop completely.

I'm not sure if changing the filter had anything to do with it but none the less, its better.

Thanks for you help!

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 Re: Pressure switch chatter
Author: redwood (CT)

As long as the filter is installed after the pump system ( pump, pressure tank, & switch) it would have nothing to do with the operation of the pump. A 3 micron will load up faster and have more pressure drop across it.

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