My Cordless Pressure Washer is having issues with the water pressure

Quick Answer

If your cordless pressure washer has low water pressure or is not delivering a consistent flow, first check for leaks, blocked nozzles or accessories, and then perform a line purge to remove any trapped air from the system.

Tip: On cordless pressure washers, it can take 10–15 seconds for the machine to draw water from the water source before full pressure is reached.

Before You Start

Before troubleshooting your cordless pressure washer, make sure:

• The battery is fully charged and correctly fitted
• The water source is clean and supplying enough water
• All hoses and accessories are securely connected
• The pressure washer is switched off before disconnecting any components

Important: Never run the pressure washer without a water supply, as this may damage the pump.

How to Fix Low Water Pressure

Follow these steps to identify and resolve the problem.

1. Check for leaks

Inspect all water connections, including:

• High-pressure hose
• Spray gun
• Lance
• Hose connectors
• Attachments

Any water leaks can reduce the pressure delivered by the machine.

2. Check for blockages

Inspect the following components for dirt or debris:

• Spray gun
• Lance
• Nozzle
• Other attached accessories

Clean any blocked nozzles before using the pressure washer again.

Perform a Line Purge

If the pressure is still low, perform a line purge to remove trapped air from the system.

1. Switch the pressure washer off

Ensure the pressure washer is switched off before starting the purge process.

2. Turn off the water supply

Close the water tap or disconnect the water source.

3. Disconnect the spray gun

Remove the spray gun or lance from the high-pressure hose.

4. Flush the system

• Turn the water supply back on
• Allow water to flow through the machine and out of the hose for 10–15 seconds

This helps remove trapped air and flush out any debris.

5. Reconnect the spray gun

Turn the water supply off again and reconnect the spray gun or lance securely.

6. Restart the pressure washer

• Turn the water supply back on
• Point the spray gun in a safe direction
• Pull and hold the trigger until water flows smoothly
• Switch the pressure washer on

The machine should now build pressure normally.

Important Information for Cordless Pressure Washers

Cordless pressure washers draw water from the source rather than being connected directly to mains pressure.

After switching on, allow approximately 10–15 seconds for the pump to draw water through the system and reach full operating pressure.

This is normal and does not indicate a fault.

If the Problem Continues

If your pressure washer still has poor water pressure after completing these checks:

• Inspect the water source for adequate flow
• Check that all accessories are compatible and correctly fitted
• Contact our customer service team via Live Chat or submit a support ticket for further assistance

Important Maintenance Tips

• Purge the system before use if the machine has been stored
• Keep nozzles and accessories clean
• Check hoses regularly for leaks or damage
• Always use a clean water source
• Allow the pump time to draw water when using a cordless pressure washer

Frequently Asked Questions

Why does my cordless pressure washer have low pressure?

The most common causes are air trapped in the system, blocked nozzles, leaking connections, or insufficient water flow.

How do I remove an airlock?

Perform a line purge by flushing water through the machine for 10–15 seconds with the spray gun disconnected before reconnecting everything and restarting the pressure washer.

How long does it take for a cordless pressure washer to build pressure?

It can take approximately 10–15 seconds for the pump to draw water from the source and reach full operating pressure.

Why is my pressure washer pulsing?

Pulsing is often caused by trapped air, a blocked nozzle, or an inconsistent water supply. Performing a line purge usually resolves the issue.

What should I do if the pressure is still low?

If you've checked for leaks, cleaned the nozzles, and completed a line purge but the problem remains, contact our customer service team for further assistance.