Help · updated 2026-10-10
Why does my pump click on and off really fast?
That click is usually the pressure switch, not the pump trying to be polite. If it chatters every second or two with no faucet open, water is escaping somewhere and the switch is chasing it.
A bad check valve does this
A check valve is a one-way door. On a well, it sits at the pump or near the wellhead so the column of water stays up in the pipe after the pump stops. When that door leaks, water falls back down the well. Pressure in the house drops, the switch clicks on, the pump bumps the pressure back up, and the water falls again.
You may hear a short run, a click off, then another start a few seconds later. Sometimes you can hear water dropping in the drop pipe. A check valve that only leaks a little can still cycle the pump enough to cook the motor over a weekend.
The pressure tank can look the same
A waterlogged tank, or a bladder that has split, leaves almost no air cushion. The switch then has nothing to lean on, so it clicks even faster — often more of a buzz than a cycle. A healthy tank lets the pump run for a bit, then rest for several minutes while you aren’t using water.
We check the tank before we blame the pump. A new motor on a dead tank, or on a check valve that dumps the well, will be back in the same trouble.
What else can cause the chatter
A leak on the house side, a stuck pressure switch, or a switch set with the cut-in and cut-out too close together will cycle a pump too. An irrigation booster can do the same thing if its tank is waterlogged or its check valve is letting the line bleed back.
Leave the pump alone if it is clicking that fast. Every start is hard on the motor. Turn it off at the breaker if you can do that without opening a panel, and call.
What we look at on a visit
Power, the pressure switch, the tank charge, and the check valve — in that order, before anyone talks about pulling a pump. If the check valve at the wellhead is the leak, the repair is often above ground. If the check is down on the pump, the pump has to come up.
This is pump and pressure equipment, which is the work we do. We don’t drill a new well to solve a clicking switch.
Short answers
Is rapid clicking an emergency?
It will ruin a motor if it keeps up, so don’t leave it running overnight. It isn’t the same as a sewer overflow. Shut the pump off and call.
Can I just widen the pressure switch?
A switch set too tight can chatter, but widening it on a bad tank or a leaking check only hides the problem and can over-pressurize the system. We’d rather find the leak.
Does this happen on irrigation pumps too?
Yes. A lawn booster with a failed check or a waterlogged tank will short-cycle the same way. The sprinklers may also surge.