Well Pump Keeps Tripping Breaker: Causes & Fixes

Common Causes

1. Failing Pump Motor

• Motor windings breaking down
• Draws excessive current (amps)
• Breaker protects by tripping
• Often happens as pump ages (10-15+ years)

2. Bad Start Capacitor

• Capacitor helps motor start
• Failed capacitor = motor struggles to start
• Draws high amps trying to start
• Trips breaker immediately or quickly
• Common and inexpensive to fix

3. Seized or Bound Pump

• Sand, sediment, or debris jams pump
• Motor can't turn
• Draws locked-rotor amps
• Trips breaker instantly

4. Electrical Issues

• Corroded wiring connections
• Damaged wire insulation
• Short circuit somewhere
• Ground fault

5. Wrong Breaker Size

• Breaker too small for pump
• Trips on normal startup surge
• Check amp rating matches pump

6. Control Box Problems (3-Wire)

• Internal components failed
• Relay sticking or burned
• Causes starting issues

7. Low Water Level

• Pump running dry
• Motor overheats without water cooling
• Thermal protection trips

Diagnosis Steps

When Does It Trip?

• Immediately (0-1 seconds): Likely motor, capacitor, or short
• Within seconds: High amp draw, binding
• After minutes of running: Motor overheating
• Random times: Intermittent electrical issue

Check the Basics

1. Is breaker properly sized? (Check pump nameplate)
2. Any obvious wire damage?
3. Control box (if 3-wire) hot or burnt smell?
4. Pressure switch contacts look okay?

Amp Draw Test

• Requires clamp meter
• Measure running amps
• Compare to pump nameplate
• High amps = motor problem

Insulation Resistance Test (Megger)

• Tests motor winding condition
• Low resistance = failing motor
• Professional test

Capacitor Test

• Check microfarad rating
• Compare to specs
• Low capacity = needs replacement

Fixes by Cause

Bad Capacitor

• Replace with correct rating
• Match microfarads AND voltage
• Cost: $20-$50 DIY, $100-$200 professional
• Most common simple fix

Control Box (3-Wire)

• Replace control box
• Match to pump HP and voltage
• Cost: $150-$350 installed

Wiring Issues

• Repair or replace damaged wiring
• Clean corroded connections
• Cost varies by extent

Wrong Breaker

• Install correct amp breaker
• Must match pump and wire size
• Cost: $20-$100

Failing Motor

• Requires pump replacement
• Motor repairs not practical for submersible
• Cost: $1,500-$5,000+ (depth dependent)

Seized Pump

• May need replacement
• Sometimes can be freed and cleaned
• Address cause (sand screen, etc.)

Safety Notes

Don't Keep Resetting

• Breaker is protecting against overcurrent
• Repeated trips may damage motor further
• One or two resets to confirm problem is okay
• Then stop and diagnose

When to Call Professional

• Not comfortable with electrical work
• Problem isn't obvious
• Need to pull submersible pump
• Repeated trips after reset

We service all major pump brands including Franklin Electric, Grundfos, Goulds (Xylem), and Sta-Rite (Pentair). Our trucks carry common parts and components for same-day repairs.

Frequently Asked Questions

Why does my well pump keep tripping the breaker?

Common causes: failing motor, bad capacitor, seized pump, electrical issues. Pattern matters: immediate trip vs after running indicates different problems.

Is it safe to keep resetting the breaker?

No—repeated tripping indicates a problem. One or two resets to confirm is okay, then stop and get diagnosis. Continued resetting may cause more damage.

How do I know if it's the capacitor?

If pump trips immediately or won't start, capacitor is a common cause. They're cheap to test/replace. Usually located in control box (3-wire) or near pump (2-wire).

Can a bad pressure switch cause this?

Usually no—pressure switch controls when pump runs, not its amperage. But a stuck-on switch could cause overheating from continuous running.

My pump is old—should I just replace it?

If pump is 10-15+ years old and motor is failing, replacement is usually better than repair. Get a diagnosis to confirm before deciding.