5 Top Pressure Washer Problems and How to Troubleshoot Them…

Some pressure washing problems are easy to fix. Other pressure washer problems will require a professional. Sometimes you are better off buying a new pressure washer. The following are the 5 top pressure washer problems and how to troubleshoot them…

Pump Problems

The two most important issues concerning breakdowns of pressure washer pump are pump cavitation and overheating due to excessive time in by-pass. Pump cavitation is caused when there is not enough water supplied to the pump. The supply to your machine must be higher gallons per minute than the rating on the pump. If you purchase a quality pressure washer you should expect it to work for many years. If your washer is older and not giving you the level of service you expect it may be time to for some repairs.

Low Pressure

We have found 9 out 10 times low pressure is caused by dirt in the pump. The dirt causes blockage in the hose, lance or nozzle. Just replace the nozzle. Is it the correct size? Is it worn out? and does it fit properly? Replacement is relatively simple once you have the right size nozzle.

Running Rough

Do you have a hot water and cold-water outdoor faucet? The #1 reason why a pressure washer begins to run rougher than usual is that the inlet water is too hot. Make sure to use cold water to get the best results. Even if you don’t have a hot water faucet, water that has been trapped in a hose  and heated by sunshine can warm it up enough to cause a problem. Also check the discharge valves and replace them if need be. If those two things do not solve the problem, we think you may have mechanical damage and may need professional service.


There are numerous seals that are distributed throughout the design of the pressure washer and any one of them may fail spontaneously to create a leak. It isn’t just water that can leak either. Oil leaks are also very common. Make sure that you check your seals at least twice per year and quickly replace ones that appear to be worn out.


This issue is almost always caused because of a dirty inlet or discharge valve. Make sure that you clean these out thoroughly after 5 or 6 uses, especially if you are pressure washing wooden materials. Even hardwood will splinter at times when high-pressure water streams are encountered. These small splinters then clog up the system. You may also have a stuck plunger for a wide variety of reasons. If your inlet and discharge valves are clean, then the plunger is the likely the cause of the pulsating, especially if you have low pressure while this is happening.

Is It time for a New Power Washer?

With a little proactive maintenance and some tender loving care, a vast majority of pressure washers from all of today’s top manufacturers will give you a long lasting tool that you can use to effectively clean all of your property. A professional can help you choose the pressure washer that best meets your needs. It is sometimes more financially reasonable to replace your unit than fix it. Either way, a professional pressure washer can diagnose the problem and give you options.

Pressure Spray, Inc. can provide you with the pressure washer you need to clean your business efficiently.  

Contact us (513.874.4484) for more information!

PSI logoAbout Pressure Spray, Inc.

Pressure Spray Inc. (PSI) has been serving Greater Cincinnati, Northern Kentucky, and Southeastern Indiana as a distributor of pressure washers, parts cleaners, and chemical cleaners for over 30 years and service more than 3,500 customers.
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