Why Does My Pressure Washer Have No Pressure? Troubleshooting Tips

Why Does My Pressure Washer Have No Pressure? Troubleshooting Tips

A pressure washer is a powerful tool for cleaning, but if your machine suddenly starts losing pressure or doesn't seem to be working as efficiently as before, it can be frustrating. The good news is, many pressure washer pressure issues can be fixed with a little troubleshooting. In this guide, we’ll look at the most common reasons your pressure washer may have no pressure and how to resolve these problems so you can get back to your cleaning tasks.

1. Clogged Nozzle

One of the most common reasons for a pressure washer to lose pressure is a clogged nozzle. Over time, dirt, debris, and other particles can get stuck in the nozzle, restricting the flow of water.

Solution:

  • Remove the nozzle from the spray wand and clean it thoroughly with a nozzle cleaning tool or a thin wire.
  • You can also soak the nozzle in warm water with a bit of vinegar to dissolve any buildup.
  • Rinse the nozzle and reattach it to the wand before testing the pressure again.

2. Blocked Water Inlet or Hose

If the water supply to your pressure washer is blocked, kinked, or restricted, it will not receive enough water to produce the necessary pressure. Ensure your garden hose and water inlet are clear of debris and properly connected.

Solution:

  • Inspect the water inlet and make sure it’s not blocked by dirt or debris.
  • Ensure the garden hose is straight, without any kinks, and that water is flowing freely.
  • Check the filter screen on the water inlet and clean it if necessary.

Pro Tip: For pressure washers like Active models, always use a clean, adequately pressurized water source. Low water flow or dirty water can contribute to pressure loss.

3. Leaking Seals or Connections

Pressure washers rely on sealed systems to maintain high pressure. If there are leaks anywhere in the system—such as around the hose connections, seals, or pump—your pressure washer won’t build the required pressure.

Solution:

  • Inspect the hose, spray gun, and all connections for any visible leaks.
  • Replace damaged O-rings or seals if you notice any water escaping.
  • If you find cracks in the hose, replace it with a new high-pressure hose.

4. Worn or Damaged Pump

The pump is the heart of a pressure washer, and if it's damaged or worn, the pressure will be compromised. Wear and tear can lead to poor pump performance, especially if the machine is older or hasn’t been properly maintained.

Solution:

  • Check the pump for any visible damage or wear.
  • Refer to the owner’s manual for pump maintenance instructions.
  • If the pump is damaged or worn out, it may need to be rebuilt or replaced. You can purchase replacement parts from the manufacturer or take it to a repair professional.

Pro Tip: For Active pressure washers, using the right pump oil and performing regular maintenance can extend pump life and ensure peak performance.

5. Air in the Pump

Air trapped in the pump can reduce the pressure significantly. This can happen if you didn’t properly prime your machine before use or if there was a disruption in the water supply.

Solution:

  • Prime the pump by running water through the system without turning on the pressure washer. Disconnect the spray gun and let water run through the hose and pump for about 1–2 minutes to purge any trapped air.
  • Reconnect the spray gun and test the pressure.

6. Incorrect or Worn Nozzle

Different cleaning tasks require different nozzles. If you’re using the wrong nozzle or if the nozzle is old and worn, it could reduce the pressure. For example, if you accidentally use a soap nozzle or a low-pressure nozzle, you won’t get the high-pressure spray you need.

Solution:

  • Check that you’re using the correct high-pressure nozzle (usually labeled 0°, 15°, 25°, or 40°) for your cleaning task.
  • If your nozzle is old, worn out, or damaged, replace it with a new one.

Pro Tip: Always inspect your nozzles for wear. A worn-out nozzle can dramatically reduce pressure and efficiency.

7. Low Water Supply or Pressure

Pressure washers require a consistent supply of water to maintain high pressure. If the water supply from your hose isn’t sufficient, your pressure washer won’t be able to perform at full power.

Solution:

  • Check that the water source is delivering enough pressure. Most pressure washers need at least 20 PSI to function correctly.
  • If you’re using a long or narrow garden hose, try switching to a shorter, wider hose to increase water flow.
  • Make sure the water source is fully open and the hose isn’t restricted in any way.

8. Dirty or Blocked Air Filter (Gas Models)

For gas-powered pressure washers, the air filter plays a crucial role in the engine’s performance. A dirty or blocked air filter can reduce airflow to the engine, causing it to lose power, which can affect the pressure output.

Solution:

  • Check the air filter on your gas pressure washer. If it’s dirty or clogged, clean or replace it.
  • Regularly maintaining the air filter will help ensure optimal performance.

9. Engine or Motor Problems (Gas and Electric Models)

If your gas pressure washer’s engine isn’t running smoothly or your electric pressure washer’s motor isn’t functioning properly, it will directly affect the machine’s pressure. Low RPMs (revolutions per minute) can lead to low pressure output.

Solution:

  • For gas models, check the engine oil levels and ensure the spark plug is clean and functioning. If the engine continues to misfire or run poorly, you may need professional servicing.
  • For electric models, ensure the power supply is stable and check for any electrical issues, such as overheating or wiring problems.

10. Overheating (Thermal Relief Valve Activation)

If your pressure washer runs for an extended period without spraying water, the machine can overheat. This activates the thermal relief valve, which reduces pressure as a safety measure to prevent damage.

Solution:

  • Turn off the machine and allow it to cool down for 15–30 minutes.
  • Avoid leaving the pressure washer running without actively using the spray gun for extended periods.

Conclusion

There are several potential reasons why your pressure washer may be experiencing low or no pressure, ranging from simple fixes like clearing a clogged nozzle to more complex issues like pump damage. By systematically troubleshooting these common problems, you can often restore your pressure washer’s performance and get back to cleaning in no time.

Remember, regular maintenance and proper use are key to keeping your pressure washer in peak condition. If you own an Active pressure washer, follow the manufacturer’s guidelines for routine care, including oil changes, nozzle maintenance, and cleaning tips. When in doubt, contact a professional for help or consult the user manual for specific troubleshooting advice.