A waterlogged tank and a failed switch look almost identical from the kitchen faucet, and they are not the same repair.
A pressure tank holds a cushion of air that lets the pump satisfy a stretch of water use without switching on and off for every glass of water drawn. When that air charge is gone, the tank is waterlogged, and the pump starts kicking on for seconds at a time, over and over — the pattern people call short-cycling. It looks alarming and it is not the pump; it is the tank, and it is a straightforward fix.
The pressure switch is the other common failure, and it is a small, inexpensive part doing an outsized job — deciding when the pump turns on and off based on tank pressure. A stuck or worn switch can mimic a dead pump, a dead well, or a dead tank depending on how it fails, which is exactly why it gets misdiagnosed as something bigger and more expensive than it is.
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