Well Pump Short Cycling: Causes and Fixes

A well pump that clicks on and off every few seconds is wearing itself out. What causes short cycling, how to check the tank and what the fixes cost.

What short cycling looks like

The pump starts, runs for a few seconds, stops, and starts again while a tap is open, or the pressure gauge swings quickly between its low and high settings. Every start heats the motor, so a pump that short-cycles for weeks can fail years early.

The usual causes

A waterlogged pressure tank: the air charge or bladder has failed, so the tank holds almost no water.
Wrong tank air pressure: the air charge should sit a little below the switch cut-in pressure, checked with the tank empty.
A clogged pressure-switch tube or a worn switch reacting to small pressure changes.
A leaking check valve or a leak in the line, so pressure drops and the pump restarts with no tap open.
An undersized tank for the pump and the house.

Quick check

Turn off the pump at the breaker, open a tap and let the tank drain, then tap the side of the tank: a hollow sound near the top means air, a dull sound all the way up means it is waterlogged. Water coming out of the air valve on top of the tank means the bladder has burst. Do not open the control box or switch cover unless you know how to work safely with live circuits.

What the fixes cost

Angi puts a pressure tank replacement at $300 to $700, and HomeGuide lists higher installed prices of $800 to $1,500. A pressure switch runs $120 to $175 installed (Angi). Fixing short cycling promptly is cheap compared with a new pump, which Angi puts at $974 to $2,821. See the pressure tank guide and repair vs replacement.

Sources

Angi, Pressure Tank Replacement Cost (Sep 18, 2026, cited as text); HomeGuide, Cost to Replace a Well Pressure Tank (Jul 25, 2025, cited as text); Angi, Well Pump Repair Cost (Sep 15, 2026, cited as text); Angi, Well Pump Replacement Cost (Aug 31, 2026, cited as text).

Prices are published US ranges from the sources listed on each page; anything we calculated ourselves is labeled as an estimate. Get at least three written, itemized local quotes. Run the estimator to build your own range.