Troubleshooting: Pressure Washer

Common Issues with Pressure Washers and How to Fix Them

Low water pressure: This is the most common problem with pressure washers. It can be caused by a clogged nozzle, a dirty water filter, a worn-out pump, or a damaged hose. To fix this issue, you can try cleaning the nozzle, replacing the water filter, checking the pump, or repairing the hose.

Water leaking: Water can leak from different parts of the pressure washer, such as the pump, the wand, or the hose. This can be caused by a damaged O-ring, a loose connection, or a cracked pump housing. To fix this issue, you can try replacing the O-ring, tightening the connections, or repairing the pump housing.

Engine/motor turning off while in use: This problem is more common in gas-powered pressure washers. It can be caused by a dirty air filter, a clogged fuel filter, a faulty spark plug, or a low oil level. To fix this issue, you can try cleaning or replacing the air and fuel filters, replacing the spark plug, or adding more oil.

Strange noises: Unusual noises coming from the pump can indicate a problem. This can be caused by a damaged pump, a loose part, or air trapped in the system. To fix this issue, you can try tightening the loose part, bleeding the air from the system, or repairing the pump.

Running harder than normal: If your pressure washer is running harder than normal, it could be because the water you’re using is too hot. This can cause the machine to struggle to maintain high pressure. To fix this issue, you can try using cold water instead of hot water.

Troubleshooting a Pressure Washer That Won’t Start

Dirty or clogged carburetor: A dirty or clogged carburetor can prevent your pressure washer from starting. You can clean it with carburetor cleaner or replace it.

Bad ignition coil: A spark plug saturated with gasoline is a sign of a bad ignition coil. You can fix this issue by replacing the ignition coil.

Excessive pump pressure: Excessive pump pressure can prevent your pressure washer from starting. Inspect and clean or replace the pressure relief valve to fix this issue.

No pressure or water coming from the pump: If your pressure washer starts but has no pressure or water coming from the pump, it could be due to a clogged wand, hose, or inlet filter. These can be easily repaired.

Strange noises coming from the pump: If there are strange noises coming from the pump and no water flowing, it could be due to a broken pump. This may need to be replaced.

Preventative maintenance can also help prevent starting issues. Make sure to drain the fuel and oil after each use and store the pressure washer properly. If you are unable to identify and fix the issue, most pressure washer manufacturers have authorized service centers where you can take your machine for repair.

How to Troubleshoot Pressure Washer Pressure Loss

Check for leaks: Small leaks, holes, or tears in your garden hose or high-pressure hose can cause your pressure washer to lose pressure when you pull the trigger. If you find leaks, plug the holes or replace the hose, which should solve your pressure issues. If there are no leaks, check for any kinks in the line which could be stalling water flow.

Check the water source and water flow: If your water supply flow is lower than the GPM (gallons per minute) on your pressure washing unit, it could be causing your pressure washer to lose pressure. Make sure your water supply flow is sufficient for your pressure washer.

Check the nozzle: The number one cause of low or no pressure when using a pressure washer is a blocked or worn nozzle. Blocked nozzles will prevent water from escaping, while a worn nozzle will reduce the pressure. Clean or replace the nozzle to restore pressure.

Check the inlet plumbing: Air leakage in the inlet plumbing can cause your pressure washer to lose pressure. Make sure the inlet plumbing is properly sealed and not leaking air.

Check the relief valve: If the relief valve is not functioning properly, it can cause your pressure washer to lose pressure. Check the relief valve and replace it if necessary.

Check the inlet suction filter: A clogged or improperly-sized inlet suction filter can cause your pressure washer to lose pressure. Clean or replace the filter to restore pressure.

Check the pump: If none of the above solutions work, it’s possible that there is a problem with the pump. This is a more serious issue that may require professional repair or replacement.

Fixing Leaks in Your Pressure Washer

Connection leaks: If the leak is from a connection, the seals on the connector may have worn out. Replace the seals or the o-ring inside the coupling.

Pump leaks: If your pressure washer is leaking water directly from the pump, and there is no noticeable damage, the internal piston seals may be worn or broken. Replace the piston seals.

Wand leaks: Water leaking from the wand where it attaches to the hose is another common spot for leaks. Replace the o-ring or the wand.

Maintaining Your Pressure Washer: Tips to Prevent Future Issues

Check fluid levels: Before using your pressure washer, check the oil and fuel levels to ensure they are at the recommended levels. This will help to prevent engine damage and ensure that your pressure washer runs smoothly.

Inspect debris screens: Debris screens prevent dirt and debris from entering the pump and causing damage. Check and clean the screens regularly to ensure that they are free from clogs and damage.

Check spray gun and hose: Inspect the spray gun and hose for any damage or leaks. Replace any damaged parts to prevent water leaks and ensure that your pressure washer operates at its best.

Prepare the detergent system: If your pressure washer has a detergent system, make sure it is clean and functioning properly. This will help to ensure that your pressure washer is effective at removing dirt and grime.

Use a pump protector: After using your pressure washer, run a pump protector through the system to prevent mineral buildup and corrosion. This will help to extend the life of your pressure washer and prevent future issues.

Flush the nozzle: Use an unfolded paperclip or nozzle tip cleaner to push debris out of the nozzle. Flush with water to rinse it away. This will help to ensure that your pressure washer is effective at removing dirt and grime.

Follow the maintenance schedule: Refer to your pressure washer’s operator manual for a maintenance schedule. This includes detailed step-by-step instructions and a maintenance schedule, which includes oil and/or filter changes. Following the maintenance schedule will help to ensure that your pressure washer operates at its best and prevent future issues.

Signs of a Faulty Pressure Washer Pump

Pressure drop or pulsating output pressure

Plungers can be wiggled easily

Leaks in cylinder head, inlet/outlet elbow or pump itself

Low pressure due to dirt blockage

Oil leaks from pump

Pressure washers are an essential tool for cleaning various surfaces, but over time, their pumps can wear out. Please know the signs of a faulty pressure washer pump to avoid further damage and costly repairs.

The most common sign of a faulty pump is a pressure drop or a pulsating output pressure. If you notice this, it’s a clear indication that something is wrong with the pump. Another sign is if the plungers can be wiggled easily.

This means that the pump is worn and ready to be replaced.

Leaks are another common problem associated with pressure washer pumps. If you notice a leak, it’s often caused by a damaged or worn seal. A leaking cylinder head or inlet/outlet elbow is often caused by a worn O-ring or gasket.

If water leaks from a crack in the pump itself, the entire pump must be replaced.

If the pump is leaking, the cause may be minor and easy to repair. Check the seals, packings, and O-rings for wear, and replace them if necessary. If the seal is fine, low pressure can be due to dirt blockage, which can be fixed by cleaning the filters and removing the dirt and debris that prevent the adequate supply of water to the pump.

If oil leaks from the pressure washer pump, one of the seals, gaskets, or pistons may be damaged, and they need to be replaced. Please address oil leaks as soon as possible, as they can cause further damage to the pump.

If you’re unsure whether to repair or replace your pressure washer pump, consider the pros and cons of each option. Repairing a pump can be less expensive than replacing it, but it may not be worth it if the pump is severely damaged or irreparable.

If you decide to replace the pump, make sure to pick the right replacement pump that is compatible with your current machine.

Fixing a Pressure Washer with Engine Running but No Water Flow

Check the water supply going into the machine. Ensure that you have a continuous water supply of about 4L per minute to operate the pressure washer normally. Also, check if you are using a ¾” diameter hose instead of the more common 5/8” diameter hose to supply water to the pressure washer. Look for any kinks or blockages in your hose. If there are none, detach the hose from the inlet valve on the washer and check to see if the water output is sufficient and that there is no debris caught in the mechanism.

Check for a blockage in the nozzle tip. Hook up your pressure washer like normal, but don’t start the engine. If there is a steady stream of water coming out of the nozzle, move on to the next tip. However, if no water or very little water is coming out of the tip, there may be an obstruction in the nozzle orifice. Shut off the engine, purge air from the pump, remove the orifice from the adjustable nozzle or remove the spray tip from the nozzle extension, and clean the orifice or spray tip using the wire tool from the maintenance kit.

If none of these solutions work, consult your outdoor power equipment manual or contact a dealer for assistance.

Troubleshooting Excessive Vibration in Pressure Washers

Dirty water inlet filter: A dirty filter can cause excessive vibration. To solve this, clean the filter according to the manufacturer’s instructions.

Faulty air intake: Check the suction circuit and ventilation to ensure they are not obstructed by dust or debris.

Insufficient water supply: Make sure the tap is fully open and the water mains flow rate complies with the instructions in the manual.

Ruptured diaphragm or air in pump: This can be caused by a leak in the hose or a low/dry tank. Upgrading to dual commercial rubber feet can also help solve the issue of excessive vibration.

If the pressure washer is pulsating instead of vibrating, the following issues may be the cause:

Kinks or blockages in the hose

Damaged or worn-out nozzle

Air trapped inside the pressure pump

To troubleshoot a surging pressure washer, consider the following steps:

Check the nozzle for dirt and clean it if necessary.

Adjust the unloader valve.

Check for blockages that may be trapping air inside.

Examine the hose for leakage.

Check the water supply and valves of the pressure washer.

Safety Precautions for Troubleshooting Your Pressure Washer

Always follow the safety instructions in the owner’s manual.

Never point the pressure washer at yourself or others.

Don’t use the spray to push or move objects.

Don’t use a gasoline-powered washer in an enclosed space.

Test the ground fault circuit interrupter (circuit breaker or outlet) before using the pressure washer.

Wear rubber-soled shoes for insulation.

Keep the pressure washer away from water runoff.

It’s also important to check the operator’s manual for troubleshooting and safety information specific to your model. Wear protective gear like gloves and safety glasses when troubleshooting. Check for debris or corrosion that may be blocking the outlet and flush the garden hose before reconnecting it to the system.

Ensure the electrical cord is plugged into a wall outlet and can provide adequate grounded power.

If unsure, consult a professional.

Detecting a Clogged Nozzle in Your Pressure Washer

Low pressure from your pressure washer can be frustrating, but a clogged nozzle may be the culprit. To determine if this is the issue, hook up your pressure washer and check each nozzle for a steady stream of water.

If there is no water or very little water coming out, there may be a blockage.

Debris or particles flowing out of the nozzle is a sign of clogging.

Other common nozzle problems include corrosion and wear and tear.

To unclog a nozzle, try using a cleaning tool or thin wire. If the nozzle is severely clogged, it may need to be replaced. However, please check for other potential causes of low pressure, such as a blocked inlet water filter or malfunctioning pump.

If you’re not confident in your ability to troubleshoot and repair your pressure washer, seek professional help.

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