I have a house where the water pump would cycle on and off every 5
seconds or so during moderate water use. Today, the water delivery
shut down completely. The holding tank and pressure switch is in the
crawl space under my house so I checked the voltage on the breaker
side of the switch (240vac). I checked the voltage on the pump side of
the switch (240Vac). I then proceded to the well opening and
verified 240Vac there. So it appears that the pressure switch is
sending power to the pump, however, the pump is dead? I don't think
it is a dry well... water seemed plentifull before hand and i was
never drawing up sediment. Also, I gave ample tie for the well to
recover if that was the case. I'm not too familair with water
pump/well systems but this seems to be pointing to a bad pump, which
is probably 19 years old.
ALso, how do you adjust a pressure switch, I don't see and adjustments
First off, thanks for bringing your question over here from HVAC. This is
the appropriate news group.
I guess since you're checking voltages that you have a multimeter? With the
power off, use your resistance scale and see if there is any reading from
the pump side of the switch. If you get no resistance (no Ohms) then your
pump is most likely history.
Some pumps have a resetable circuit breaker on them. Look at the outside of
the pump and see... it's usually red and looks like a tiny switch. You can
try this but the breaker probably tripped because your pump is worn out.
If the pressure switch is giving the pump the volts... don't adjust it. It
isn't your problem.
Let us know if you need help checking the resistance.
Suggest call in a pro, sounds like your tank is waterlogged and now you have
damaged the switch, controller or pump due to repeatedly short cycling the
Now, we need to know how many wires actually go down to the pump, and get an
ohms reading of the pump windings to know if the pump is for sure dead, just
as Jake has suggested.
And getting the pump to run again is only part of the work you have ahead,
you still need to get the tank un-waterlogged, if you dont, you will
eventually cause more damage to the electricals--you can drain the tank to
get air into it once a week or so as a temporary measure, but it is
something you definately do need to eventually get fixed properly.
Now some common things are burnt contacts on the pressure switch, a simple
voltage reading will still show voltage, but not enough current can be
supplied through them to actually start the pump if this is the case.
Many pumps also have a controller box, inside it there is a start relay,
this can sometimes go bad--there is also a start capacitor in there, these
too can go bad from overheating due to short cycling too.....
Many things to check, a pro will usually have anything needed on his service
truck to repair the system quickly, usually with less than one hours labor
charge, save for if he finds the pump has burnt up.
Good luck--and if you can describe the system better for us, myself and some
of the others can probably eventually walk you through most of this.
Agree. Sounds like the system has been 'waterlogged' for quite a while! Many
systems have a 'snifter' valve that add air when the pump is running to
ensure that a proper 'head' of air pressure is maintained; the poster does
not describe their system or mention whether it is has a membrane type
pressure tank etc.
Get some help; the business of the pump cutting in and out every few seconds
could have put as much wear and tear on all parts of the system in three
months as normally in five to ten years!
It is possible to put out much effort and replace wrong things at
considerable cost and achieve nothing!
It is most unlikely that the pressure switch needs 'adjustment' although it
may, depending on the system, be burnt out by overuse? Once the system is
working again would be the time to check the pressure. Overall it might just
be something simple.
Also it MIGHT be possible to get the system working temporarily by
repairing/fixing or bypassing one item, maybe get it working by switching on
manually just to get a bit of water but must be done with care to avoid
breaking something else. Also it is a 240 volt system so be careful!
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