PDF download

Why Is The High Pressure Washer Losing Power?


High-pressure washers, often referred to as pressure washers or power washers, are versatile tools used for cleaning a wide range of surfaces, from driveways and vehicles to decks and siding. These machines rely on a powerful stream of pressurized water to remove dirt, grime, and stains effectively. However, if a high-pressure washer loses power, it can be frustrating and hinder your cleaning efforts.

1. Water Supply Issues

Cause: A common reason for a high-pressure washer losing power is insufficient water supply. If the machine does not receive an adequate flow of water, it won't be able to generate the necessary pressure.


Check Water Source: Ensure that the water source (usually a garden hose) is fully turned on and provides a consistent flow of water.

Unclog Filters: Clean or replace inlet filters or strainers to remove debris that may be blocking water flow.

Use a Larger Diameter Hose: If the hose diameter is too small, it can restrict water flow. Consider using a hose with a larger diameter to improve water supply.

2. Hose and Nozzle Issues

Cause: Clogged or damaged hoses and nozzles can restrict water flow and reduce the pressure generated by the high-pressure washer.


Inspect and Clean Hoses: Check the high-pressure hose for kinks, leaks, or blockages. Clean any debris from the hose.

Examine Nozzles: Inspect the nozzle for clogs or damage. Clean or replace the nozzle if necessary.

Use the Correct Nozzle: Ensure you are using the appropriate nozzle for the task. Different nozzles provide varying levels of pressure and spray patterns.

3. Air in the System

Cause: Air trapped in the pressure washer's system can disrupt water flow and reduce pressure.


Bleed Air: Most pressure washers have a priming or bleeding procedure to remove trapped air. Follow the manufacturer's instructions to bleed air from the system.

Check Connections: Inspect hose connections and fittings for air leaks. Tighten any loose connections or replace damaged components.

4. Low Engine RPM or Motor Issues

Cause: If the engine (gasoline-powered) or motor (electric-powered) is not running at the correct speed, the high-pressure washer may lose power.


Gasoline-Powered Engine: Check the throttle control to ensure the engine is running at the proper RPM. Refer to the engine manufacturer's instructions for adjustments.

Electric Motor: Verify that the power supply is adequate and that the motor is functioning correctly. Consult the manufacturer's manual for troubleshooting steps.

5. Pump Problems

Cause: Issues with the high-pressure pump can lead to a loss of power. Pump problems may include wear, damage, or malfunction.


Inspect Pump Components: Examine the pump for damaged or worn parts, such as seals, valves, and pistons. Replace any components that show signs of wear.

Regular Maintenance: Perform routine maintenance on the pump, including oil changes and cleaning, as specified in the manufacturer's manual.

Consult a Professional: If you are unsure about pump maintenance or experience persistent issues, consult a professional for diagnosis and repair.

6. Insufficient Water Pressure

Cause: If the water supply from the source is too weak, the high-pressure washer may not be able to achieve the desired pressure.


Use a Different Water Source: If possible, connect the high-pressure washer to a different water source with higher water pressure.

Install a Booster Pump: In cases of consistently low water pressure, consider installing a booster pump to increase the supply pressure to the high-pressure washer.

7. Worn or Damaged Parts

Cause: Over time, parts of the high-pressure washer may wear out or become damaged, affecting its performance.


Regular Inspection: Periodically inspect all components, including hoses, fittings, and trigger guns, for signs of wear or damage. Replace worn or damaged parts promptly.

Proper Storage: Store the high-pressure washer in a clean, dry, and protected environment to prevent unnecessary wear and exposure to the elements.


High-pressure washers are valuable tools for cleaning a variety of surfaces, but they require proper maintenance and troubleshooting when they lose power. By identifying and addressing the root causes of power loss, you can ensure that your high-pressure washer operates efficiently and effectively. Regular inspections, correct usage, and adherence to manufacturer recommendations are key to maintaining optimal performance and extending the lifespan of your high-pressure washer.

Contact Us