Common Pressure Washer Problems and How to Fix Them 

A high-pressure washer is an essential tool for businesses and homeowners, but like any machine, it can encounter issues over time. Understanding common pressure washer problems and their solutions can save you time and money while keeping your equipment running efficiently. At Eurojet, we provide expert advice and high-quality pressure washers across Ireland. Here’s a guide to troubleshooting your pressure washer. 

1. Low or No Pressure 

Possible Causes: 

• * Clogged nozzle or spray tip
• * Air in the pump
• * Worn-out pump seals
• * Low water supply

How to Fix: 

• * Check and clean the nozzle 
• * Run water through the system to remove air pockets 
• * Inspect and replace worn seals 
• * Ensure an adequate water supply with the right hose size 

2. Pressure Washer Won’t Start 

Possible Causes: 

• * Faulty spark plug (for petrol models) 
• * Clogged carburetor 
• * Tripped circuit breaker (for electric models) 
• * Low oil level 

How to Fix: 

• * Clean or replace the spark plug 
• * Clean the carburetor to remove blockages 
• * Reset the circuit breaker 
• * Refill or change the oil if needed 

3. Leaking Pressure Washer 

Possible Causes: 

• * Loose or damaged hose connections 
• * Worn-out pump seals or O-rings 
• * Cracked pump housing 

How to Fix: 

• * Tighten all hose connections 
• * Replace faulty seals or O-rings 
• * If the pump housing is cracked, consider professional repair or replacement 

4. Pressure Fluctuations (Pulsing or Surging) 

Possible Causes: 

• * Blocked inlet filter 
• * Air trapped in the pump 
• * Inconsistent water supply 

How to Fix: 

• * Clean or replace the inlet filter 
• * Run the washer without the spray gun to remove air 
• * Ensure a steady water supply 

5. Soap or Detergent Not Dispensing 

Possible Causes: 

• * Clogged soap nozzle 
• * Incorrect detergent type 
• * Air leaks in the detergent tube 

How to Fix: 

• * Use a dedicated soap nozzle 
• * Ensure you’re using the correct detergent for pressure washers 
• * Check the detergent tube for leaks or blockages 

6. Overheating Pressure Washer 

Possible Causes: 

• * Running the washer too long without releasing the trigger 
• * Inadequate water flow 
• * Malfunctioning thermal valve 

How to Fix: 

• * Avoid keeping the machine running without spraying 
• * Ensure proper water flow to the pump 
• * If overheating persists, check the thermal release valve 

Preventative Maintenance Tips 

To avoid costly repairs, follow these best practices:

• * Regularly clean filters, hoses, and nozzles 
• * Store the pressure washer in a dry, frost-free area 
• * Use the correct fuel and oil for petrol/diesel models 
• * Perform routine servicing to extend lifespan