Well pressure switch not kicking on

Symptoms

• No water at all, pump doesn't seem to start
• Pressure gauge shows low or zero pressure with the pump silent
• Switch may show visible corrosion on its contacts
• Manually tapping the switch sometimes gets the pump to start briefly

Likely causes

• CommonCorroded or dirty electrical contacts inside the pressure switchOver time, contacts can oxidize or accumulate debris, preventing the switch from closing the circuit properly.
• CommonPressure switch set point too low or miscalibratedIf the switch's cut-in pressure has drifted, it may not trigger the pump to start until pressure is unrealistically low.
• PossibleTripped breaker or blown fuse feeding the switch and pump circuitAn electrical issue upstream of the switch can look identical to a switch failure from the homeowner's perspective.
• Less commonFailed pump motor unrelated to the switchIf the switch tests fine electrically, the pump motor itself may have failed.

What to do

1. Check the breaker panel first and reset any tripped breaker for the well pump circuit.
2. Locate the pressure switch, usually near the pressure tank, and visually inspect for corrosion on the electrical contacts.
3. With power off, some switches allow manually cleaning the contacts with fine sandpaper or a contact cleaner; this should only be done by someone comfortable with basic electrical safety.
4. Check the pressure switch's cut-in setting against the current tank pressure reading to see if it's out of range.
5. If comfortable and confident, a qualified person can test switch continuity with a multimeter to confirm whether it's the switch or something further downstream.
6. If the switch tests fine electrically but the pump still doesn't start, the issue is likely the pump itself or its wiring, which needs a well technician.
7. Given the electrical component involved, many homeowners choose to have a well technician handle switch diagnosis and replacement directly.

Tools and parts

• Multimeter (for testing, professional use recommended)
• Fine sandpaper

When to call a pro

Call a well contractor or electrician if you're not comfortable testing or replacing the pressure switch, or if it tests fine and the pump itself is suspected.

Safety