Pressure washers & generators

Electric pressure washer trips the GFCI outlet

A GFCI outlet tripping right away or repeatedly usually means water has gotten into an electrical connection, the cord or plug is damaged, or the motor is drawing too much current on an overloaded circuit.

Difficulty
Easy
Time
15–30 minutes
DIY cost
$0–$30
Pro cost
$70–$150

Symptoms

  • GFCI outlet trips as soon as the washer is plugged in or turned on
  • Trips intermittently during use, especially near water spray
  • Extension cord feels warm
  • Breaker trips instead of just the GFCI

Likely causes

  • CommonWater intrusion into the plug, cord, or motor housingElectric pressure washers generate a lot of spray and mist; water reaching electrical connections is a very common GFCI trip cause.
  • CommonDamaged power cord or plugNicks, cracks, or exposed wire in the cord can cause a ground fault.
  • CommonUsing an underrated or damaged extension cordA cord that's too long or too thin for the motor's draw can cause voltage drop and nuisance tripping.
  • PossibleMotor winding fault developingAn aging motor can develop an internal short that trips a GFCI reliably.
  • PossibleFaulty GFCI outlet itselfTest with another GFCI-protected outlet if available to rule this out.

What to do

  1. Unplug the unit and inspect the entire cord and plug for cracks, cuts, or exposed wire.
  2. Make sure the plug and cord connections are completely dry before plugging back in.
  3. Avoid directing spray toward the machine's motor housing, cord, or outlet area while using it.
  4. If using an extension cord, confirm it's rated for outdoor use and heavy enough gauge (12 or 14 AWG) for the pressure washer's amperage.
  5. Try a different GFCI outlet or have an electrician test the one you're using.
  6. Let the unit dry out completely (several hours) if it may have gotten wet internally, then try again.
  7. If the GFCI trips immediately every time on a known-good outlet and cord, the motor likely has an internal fault and needs professional evaluation or replacement.

Tools and parts

  • None required for basic checks
Outdoor-rated extension cordSearch: “heavy duty outdoor extension cord 12 gauge”

When to call a pro

If the motor itself has an internal short, take it to a small appliance or power-equipment repair shop rather than attempting motor repair yourself.

Safety

Use caution

Never bypass a tripping GFCI outlet or use the machine with a damaged cord; this indicates a real electrical fault risk around water.

Related guides

Operator provides AI-generated troubleshooting information. It can be wrong. For safety-critical, electrical, gas, structural, medical, automotive safety, or other high-risk problems, consult a qualified professional.