Top Reasons Your Pressure Washer Is Losing Pressure and How to Fix It

When your pressure washer starts losing power, it can bring your operations to a grinding halt. Whether you’re in agriculture, construction, or manufacturing, consistent water pressure is critical for cleaning efficiency and equipment longevity. To help you keep your pressure washer working at peak performance, we are sharing a comprehensive troubleshooting guide. Here we explore the top reasons your pressure washer might be losing pressure, how to fix it, and when it’s time to call in the pros.

Why Your Pressure Washer Has Low Pressur

Clogged or Damaged Nozzle

One of the most frequent issues behind low pressure is a clogged nozzle. Dirt, mineral deposits, or debris can easily block the nozzle opening, restricting water flow and weakening the spray. If your spray pattern looks uneven or weak, remove the nozzle and inspect it closely. Cleaning it with a nozzle tool or a fine wire often restores full pressure. However, if the nozzle is worn out or the opening has widened over time, it’s best to replace it with a properly sized one.

To prevent clogged pressure washer nozzles, flush them regularly and consider using a water filter to reduce sediment buildup.

Air in the System

Air trapped in the pressure washer system can cause sputtering or pulsating pressure. This often happens when hoses aren’t properly connected or if there’s a leak in the suction line. To fix it, turn off the machine and check all hose fittings for tightness. Then, run water through the system without the nozzle attached to purge any air.

Priming your washer before each use and inspecting hoses for cracks or loose fittings can help prevent air from entering the system in the first place.

Inadequate Water Supply

Your pressure washer needs a consistent and sufficient water supply to function properly. If the water source doesn’t provide enough flow (measured in gallons per minute), the machine won’t be able to maintain pressure.

Check for kinks in the hose, clogged inlet filters, or restrictions in the water line. Using a high-flow hose and cleaning the inlet screen regularly can help ensure your washer gets the water it needs.

Worn Pump Components

Over time, internal pump parts like valves, seals, and pistons can wear down, leading to gradual pressure loss. If you’ve ruled out external issues and your machine still isn’t performing, the problem may lie inside the pump. This type of repair typically requires professional tools and expertise.

Following the manufacturer’s maintenance schedule and using the correct pump oil can extend the life of your pump and reduce the risk of pressure-related issues.

Unloader Valve Problems

The unloader valve regulates pressure when the trigger is released. If it’s stuck, misaligned, or worn out, it can cause pressure to spike or drop unexpectedly. Sometimes, a simple adjustment is all that’s needed. In other cases, the valve may need to be replaced.

Regular lubrication and inspection of the unloader valve can help keep it functioning smoothly.

Keep Your Equipment in Top Shape – Pressure Washer Maintenance Tips

To reduce the risk of pressure loss in the future, make preventative maintenance part of your routine.

Important tasks include:

• Flushing your system after each use
• Replacing nozzles and filters regularly
• Checking oil levels and changing pump oil as recommended
• Storing equipment in a clean, dry environment
• Scheduling annual professional inspections

When to Call in the Pros

If you’ve tried the above fixes and your pressure washer still isn’t performing, it’s time to bring in expert help. Persistent pressure issues may point to deeper mechanical problems that require specialized tools and knowledge for a proper fix. Attempting to fix complex mechanical issues in your pressure washer without the necessary skills is not only unsafe but also unwise, as it may worsen the problem and lead to more costly repair services.

At Hotsy Water Blast, our certified technicians can diagnose and repair all makes and models of commercial and industrial pressure washers. We also offer preventative maintenance programs to keep your equipment running at peak performance year-round.

Don’t Let Pressure Problems Slow You Down

 Low pressure doesn’t have to mean lost productivity. With the right troubleshooting steps and help from the experts, you can get back to full power in no time. Contact Hotsy Water Blast today to schedule a service appointment or request a diagnostic inspection. Our team is here to keep your pressure washer, and your business, running strong in Western Canada and the US. Reach out to us.