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Sump pump continuoulsy re-activates from water draining thru anti-airlock hole.

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I have a sump pump with a vertical switch to drain rainwater from the basement.  Per instruction I drilled a 1/16" hole in the pipe below the check valve as an anti-airlock hole.  Now after the pump is finished clearing the pit, water drains out of the anti-airlock hole and fills the pit up again to the extent that the vertical switch is activated, the pump restarts, and then this just continues.  What should I do?
asked in Sump Pump by qgca (120 points)
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1 Answer

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Hi qgca,
There shouldn’t be that much water left in the pipe between the check valve and the hole… 
  • The check valve might be improperly installed / reversed so it doesn’t hold water
  • The check valve might be damaged or stack in open position
  • The check valve has been installed / positioned improperly and it doesn’t close, for example on a vertical section of a discharge pipe
  • The check valve is too high above the sump pump so there’s still a lot of water beneath it
  • The sump pump well is very small / requires very little water to activate its switch
  • Pump’s floating (vertical?) switch needs adjustments so it activates the sump at a higher level of water
  • Depending on the depth of your sum pump pit you may need to elevate the sump pump slightly which would prevent constant switch activation
Maybe one of the above or combinations of those conditions are responsible. Since you didn’t describe this sump pump installation in detail I can’t give you an absolute answer. Let me know when you track the problem or whenever you have more questions. Just click “comment” below. 
answered by darekrudy (21,730 points)