Troubleshooting Guide: Why Your Pressure Washer Won't Turn On (Step-by-Step Solutions)

Struggling with a pressure washer that won't start? Follow this troubleshooting guide to identify and fix the problem in minutes.

1. Start with Basic Checks

When your pressure washer refuses to start, the cause could be anything. Start by ensuring your unit is set up in a compatible environment.

Check the Outlet: Make sure your pressure washer is plugged into a reliable 15A-20A outlet rated for 120 volts and 13 amps.
Avoid Extension Cords: If you're using an extension cord, try connecting directly to the outlet. If unavoidable, use a 14-gauge cord no longer than 50 feet.
Dedicated Outlet: A dedicated outlet, where no other appliance shares the breaker, helps ensure consistent power.

If setup checks don’t solve the issue, the GFCI plug might be causing problems.

Unplug the unit and disconnect the water hose.
Unscrew the four main screws in the GFCI plug to access the wiring terminals.
Use a screwdriver to tighten the terminal wires, as loose connections may disrupt power.
Reassemble the GFCI plug and insert it into the outlet. Press the "Test" button, followed by "Reset."

Once the green light on the GFCI turns on, switch the washer to "On" to see if the pump pressurizes.

Note: If the GFCI plug overheats and fails, replacement may be necessary. We’ll cover this topic in detail in a future guide.

If issues persist, try a dry test on the pump:

Disconnect the water line and plug in the power cable. Ensure the GFCI's green light is on.
Turn on the washer for a quick 3-second test. This will evaluate the electrical system.
Repeat up to six times until the motor starts. If it does, turn off promptly to avoid damage.

If the motor starts but issues persist when accessories are connected, check the spray orifices.

Remove Debris: Ensure no blockages are present in the nozzle.
Orifice Size: Verify that the orifice size is between 4.5 and 6.0 for optimal performance.