Dewalt 3400 Psi Pressure Washer Not Working [Step-By-Step Fixes]

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Updated in April 2025 | By John

Do you have a DeWalt 3400 PSI pressure washer that isn’t working You’re not alone. This is a common problem, and it can be frustrating and inconvenient. But don’t worry, there’s a good chance you can fix it yourself.

In this guide, I’ll walk you through the steps to troubleshoot and repair your DeWalt 3400 PSI pressure washer. I’ll cover everything from common problems to more complex issues. By the end of this guide, you’ll have your pressure washer up and running again in no time.

Why Dewalt 3400 Psi Pressure Washer Not Working

No Power

The power cord is not plugged in or is not plugged in all the way.
The pressure washer is not turned on.
The pressure washer’s circuit breaker is tripped.
The pressure washer’s thermal overload protector has tripped.
The pressure washer’s pump is not working.

No Water

The water supply is turned off.
The water hose is not connected to the pressure washer or is not connected tightly.
The water hose is kinked or blocked.
The pressure washer’s water filter is clogged.
The pressure washer’s pump is not working.

Low Pressure

The water pressure is too low.
The pressure washer’s pump is not working properly.
The pressure washer’s water filter is clogged.
The pressure washer’s nozzle is clogged.

High Pressure

The water pressure is too high.
The pressure washer’s pump is not working properly.
The pressure washer’s nozzle is damaged.

How to Troubleshoot: Dewalt 3400 PSI Pressure Washer Not Working

Symptoms of a Dewalt 3400 PSI Pressure Washer Not Working

There are a few different symptoms that may indicate that your Dewalt 3400 PSI pressure washer is not working properly. These include:

The pressure washer won’t start
The pressure washer starts but doesn’t generate any pressure
The pressure washer generates low pressure
The pressure washer leaks
The pressure washer makes strange noises

Troubleshooting a Dewalt 3400 PSI Pressure Washer

If your Dewalt 3400 PSI pressure washer is not working properly, you can troubleshoot the problem by following these steps:

1. Check the power cord:
Make sure that the power cord is plugged into an outlet and that the outlet is working properly.

2. Check the water supply:
Make sure that the water supply is turned on and that there is enough water pressure.3. Check the oil level:
Make sure that the oil level is correct.

4. Check the air filter:
Clean or replace the air filter if it is dirty.

5. Check the fuel filter:
Clean or replace the fuel filter if it is dirty.

6. Check the spark plug:
Clean or replace the spark plug if it is fouled.

7. Check the fuel pump:
Make sure that the fuel pump is working properly.

8. Check the pressure washer pump:
Make sure that the pressure washer pump is working properly.

Common Causes of Dewalt 3400 PSI Pressure Washer Problems

There are a few common causes of Dewalt 3400 PSI pressure washer problems. These include:

Power cord problems:
If the power cord is not plugged in properly or if the outlet is not working, the pressure washer will not start.

Water supply problems:
If the water supply is turned off or if there is not enough water pressure, the pressure washer will not generate any pressure.

Oil level problems:
If the oil level is too low, the pressure washer will not start.

Air filter problems:
If the air filter is dirty, the pressure washer will not start or will not generate enough pressure.

Fuel filter problems:
If the fuel filter is dirty, the pressure washer will not start or will not generate enough pressure.

Spark plug problems:
If the spark plug is fouled, the pressure washer will not start or will not generate enough pressure.

Fuel pump problems:
If the fuel pump is not working properly, the pressure washer will not start or will not generate enough pressure.

Pressure washer pump problems:
If the pressure washer pump is not working properly, the pressure washer will not generate any pressure.

How to Prevent Dewalt 3400 PSI Pressure Washer Problems

You can help prevent Dewalt 3400 PSI pressure washer problems by following these tips:

Inspect the pressure washer regularly:
Check the power cord, water supply, oil level, air filter, fuel filter, spark plug, fuel pump, and pressure washer pump regularly for any signs of wear or damage.

Maintain the pressure washer properly:
Follow the manufacturer’s instructions for maintaining the pressure washer. This includes changing the oil and air filter regularly, cleaning the fuel filter, and replacing the spark plug as needed.

Store the pressure washer properly:
When not in use, store the pressure washer in a cool, dry place.

By following these tips, you can help prevent Dewalt 3400 PSI pressure washer problems and keep your pressure washer running smoothly for years to come.

Also Read: Dewalt 3800 Psi Pressure Washer Soap Dispenser Not Working

FAQs: Dewalt 3400 PSI Pressure Washer Not Working

Why is my Dewalt 3400 PSI pressure washer not working?

There are a few possible reasons why your Dewalt 3400 PSI pressure washer may not be working. Here are some of the most common causes and solutions:

The power cord is not plugged in properly: Make sure that the power cord is plugged into an outlet that is working and that the outlet is turned on.

The pressure washer is not turned on: Check the power switch to make sure that it is in the On position.

The pressure washer is not primed: Priming the pressure washer involves filling the pump with water and pressurizing the system. To prime the pressure washer, follow the instructions in the owner’s manual.

The pressure washer is clogged: The pressure washer may be clogged with dirt or debris. To clean the pressure washer, follow the instructions in the owner’s manual.

The pressure washer is damaged: If the pressure washer is damaged, it will need to be repaired or replaced.

How do I prime my Dewalt 3400 PSI pressure washer?

To prime your Dewalt 3400 PSI pressure washer, follow these steps:

1. Turn off the pressure washer and disconnect the power cord.
2. Remove the water inlet hose from the water source.
3. Attach the water inlet hose to the primer bulb.
4. Squeeze the primer bulb until it is firm.
5. Reattach the water inlet hose to the water source.
6. Turn on the pressure washer and allow it to prime for a few seconds.
7. Test the pressure washer by spraying it on a piece of cardboard.

How do I clean my Dewalt 3400 PSI pressure washer?

To clean your Dewalt 3400 PSI pressure washer, follow these steps:

1. Turn off the pressure washer and disconnect the power cord.
2. Remove the water inlet hose from the water source.
3. Remove the detergent bottle from the pressure washer.
4. Use a garden hose to rinse the exterior of the pressure washer.
5. Use a brush to clean the dirt and debris from the pressure washer.
6. Reattach the water inlet hose and detergent bottle to the pressure washer.
7. Turn on the pressure washer and allow it to run for a few seconds to flush out any remaining dirt or debris.

What do I do if my Dewalt 3400 PSI pressure washer is leaking?

If your Dewalt 3400 PSI pressure washer is leaking, there are a few possible causes and solutions:

The o-rings are worn out: The o-rings are small rubber rings that seal the connections between the different parts of the pressure washer. If the o-rings are worn out, they can leak water. To fix this problem, you will need to replace the o-rings.

The seals are damaged: The seals are rubber rings that seal the pump and other parts of the pressure washer. If the seals are damaged, they can leak water. To fix this problem, you will need to replace the seals.

The pressure washer is damaged: If the pressure washer is damaged, it can leak water. To fix this problem, you will need to have the pressure washer repaired or replaced.

What do I do if my Dewalt 3400 PSI pressure washer is smoking?

If your Dewalt 3400 PSI pressure washer is smoking, there are a few possible causes and solutions:

The pressure washer is overheating: The pressure washer may be overheating if it is being used for too long or if it is not being used properly. To fix this problem, you will need to let the pressure washer cool down and then use it for shorter periods of time.

The pressure washer is clogged: The pressure washer may be clogged if it is not being cleaned properly. To fix this problem, you will need to clean the pressure washer according to the instructions in the owner’s manual.

The pressure washer is damaged: If the pressure washer is damaged, it may be smoking. To fix this problem, you will need to have the pressure washer repaired or replaced.

 

About The Author

I am John, and I am the creator of this website. I have been in the woodworking industry for about 5 years. I developed my passion for DIY projects around the house when I was in high school. I have discovered a new appreciation for those who have the experience to pass along their expertise. They know what works best and are able to help others. I am proud to be among them.

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