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Pump was short cycling. Replaced pressure switch 40/20. tank pressure was 50psi. Set pressure to 18psi. Now 2 weeks later pump short cycling again. Tank pressure up to 30psi. This is weird! Help!

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6ya6ya
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Posted on Jan 02, 2017

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SOURCE: sears 1hp shallow well pump pressure switch stops at 50psi

What's the problem??

Posted on Oct 24, 2009

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aquaman987
  • 927 Answers

SOURCE: I replaced old pump w/

The water and therefore the pressure has to be going somewhere. If you are sure that there are no leaks in the house or outside, then the water is going back into the well. There is a check valve either in the suction line of the pump between the top of the well and the pump or down in the well.
If this check valve fails, it allows water to go the wrong way and back to the well. The result is that you lose pressure.
Secondly, you have to be sure that there are no air leaks between the top of the well and the inlet to the check valve. Leaks in that piping will make repriming difficult.
Write back with more and I'll try to help more.
Gary

Posted on Jan 22, 2011

  • 512 Answers

SOURCE: my 1/2 hp mastercraft pump cycles ever 3 seconds roughly. The pressure switch is set at 40-60psi. Should I replace or upgrade my pressure tank?

You might want to make sure you have proper air volume in pressure tank.


Shut down system. Drain tank. Fill tank with air via Shrader valve on top of tank until it has a few less psi than the low cut off setting. This will ensure that the tank still has water in it with some pressure still pushing it out when the pump kicks back on.


Without that cushion of air, the pump short cycles. ie every 3 seconds.....


http://www.pumpsandtanks.com/faq_page.htm#air

Posted on Aug 20, 2012

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My 1/2 hp mastercraft pump cycles ever 3 seconds roughly. The pressure switch is set at 40-60psi. Should I replace or upgrade my pressure tank?


You might want to make sure you have proper air volume in pressure tank.


Shut down system. Drain tank. Fill tank with air via Shrader valve on top of tank until it has a few less psi than the low cut off setting. This will ensure that the tank still has water in it with some pressure still pushing it out when the pump kicks back on.


Without that cushion of air, the pump short cycles. ie every 3 seconds.....


http://www.pumpsandtanks.com/faq_page.htm#air

Aug 12, 2012 | Plumbing

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I lowered my water pressure on the tank because my water line pressure was 62 psi, and ruptured my water heater. Now my water pump runs almost all the time. How to I set up my tank properly.


pressure switch,look under cover tells you how too set there's low set and high set,look at pressure guage should click on at 30psi shut off at 50psi, adjust to this, just be careful don.t get shocked'power goes to switch for your pump. that would be first thing i'd check.

Jan 24, 2011 | Plumbing

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I replaced old pump w/ Flotec 1/2HP FP4012 and replaced old pressure tank w new 35gal tank. Pump primed but cycles on-off every minute constantly even w/ no water turned on. Goes to 50PSI, loses pressure...


The water and therefore the pressure has to be going somewhere. If you are sure that there are no leaks in the house or outside, then the water is going back into the well. There is a check valve either in the suction line of the pump between the top of the well and the pump or down in the well.
If this check valve fails, it allows water to go the wrong way and back to the well. The result is that you lose pressure.
Secondly, you have to be sure that there are no air leaks between the top of the well and the inlet to the check valve. Leaks in that piping will make repriming difficult.
Write back with more and I'll try to help more.
Gary

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Gould 1/2hp submergible well pump cycles on and off constantly. low to no water pressure .The pressure switch remains in the closed position. Power to pump side of pressure switch good. pump runs 15...


My first thought was that of a water logged tank which causes short cycling, from your notes the tank is good (the tank may be partially water logged though) If the tank is ok and your getting short cycling (and the switch is good) I would guess your check valve down the well has failed. As the pump creates pressure then shuts off the water may be going right back down the well causing the pump to cycle again. This could also account for the poor water pressure as the check valve may be stuck slightly open allowing the system to loose pressure but only allowing a small amount of flow by when running. There could be a leak within the pumps drop-pipe and your loosing pressure through this leak. I expect you'll have to have the pump pulled.
I hope this may have helped,
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Flotec 42 gallon water tank - short cycling and changing water stream...do I need a new tank or could it be another problem?


These holding tanks are pre charged with air which in turn pressurizes the water. The tank has a bladder and an air valve on top. The pre charge ,over time, loses pressure, and the tank has to be pressurized again.
  • The well pump needs to be turned off.
  • The water has to be drained from the tank
  • Air is put into the tank from the air valve on top of the tank, and is measured with a tire air gauge.
  • The pre charge pressure is set to two psi below the pump cut in pressure.
  • In other words if your pump kicks on at 30 psi, the pre charge pressure is set at 28 psi. If the pump kicks in at 20 psi, the pre charge is set at 18psi, etc.
  • After you pressurize the tank, turn water back on.
  • If water comes out of air valve on top of tank, then the bladder is ruptured and you need a new tank.
  • Hope this helps!

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