Effectively troubleshooting a pressure washer requires identification of the exact problem. Common issues include the soap injector failing to work, the engine stopping after a few minutes, the machine not starting, water leaking, the washer running poorly, and the washer lacking pressure.
Straightforward issues can be fixed using the product's manual, manufacturer's website, or other trusted troubleshooting guide online. Specific instructions for how to handle those issues will depend on the brand, and/or model of pressure washer. Hiring a professional technician may be the better choice to handle problems that are more complex, or that you may not be comfortable resolving on your own.