Pressure Solutions

Tips & Hints

Why has my water blaster lost pressure?

A common cause for lost water pressure is when the nozzle at the end of the trigger-wand becomes worn or blocked. An uncommon spray pattern may be an indication that there is debris blocking the nozzle. Nozzles that are wearing will usually cause a gradual loss in pressure, as opposed to happening suddenly.

Below is a table showing all the common symptoms of water blaster issues, we have compiled this and it will hopefully assist with you being able to solve any simple issue before needing to contact us where we are more than happy to assist you.


Water Pressure Problems
What’s Wrong? Cause How to Fix
1. Low pressure Insufficient inlet water supply Unkink garden hose, ensure full water pressure coming from tap, use large enough diameter garden hose (see manual)
Blocked inlet water filter Remove garden hose connection and remove debris
None or incorrect nozzle Ensure correct nozzle being used
2. No pressure Damaged unloader valve Adjust unloader screw, check for damaged seals/springs
Damaged pump inlet valves/manifold Disassemble pump and replace/clean components of inlet manifold
3. Pulsing pressure (high then low) Damaged pump inlet valves/manifold Disassemble pump and replace/clean components of inlet manifold
Faulty pump Replace pump
Pump sucking air Turn off machine (but not water supply) and release pressure by squeezing trigger gun
Obstructed nozzle, water inlet filter or gun/spray wand Use needle to clear nozzle, fresh water to flush water inlet and vinegar to clear any deposits in gun/wand
4. Spiking pressure Poorly calibrated unloader valve Adjust unloader to proper pressure as per manual
5. Pressure drops after a few seconds use Nozzle blocked Clear nozzle with needle
Issues with unloader valve Remove unloader and clean/repair
6. Pressure washer isn’t cleaning the surface Using wrong nozzle Switch to higher pressure spray nozzle


Water Leaking
What’s Wrong? Cause How to Fix
1. Water leaking from pump Seals broken, cracked or worn Return and replace under warranty
Loose bolts on pump assembly Tighten bolts to ensure pump casing properly sealed together
Thermal valve activated Wait 5 minutes before using (it will de-activate once cool enough)
2. Water leaking from garden hose connection Broken or improper connection Connect properly
Broken rubber washer Replace
3. Water leaking from spray wand or connections Broken o-ring inside hose connection Replace o-ring or return hose for new
Not properly connected Connect properly


Gas Power Washer Issues
What’s Wrong? Cause How to Fix
1. Engine will not start No gas Fill with gas
Choke is wrong position Move to correct position as per manual
Pressure build up Squeeze trigger gun to release pressure in system
Spark plug wire not connected Connect wire
Faulty spark plug Replace with new
2. Engine stops running while in use Low oil level Check and fill oil
Dirty air filter Clean or replace it
3. Engine not providing enough power Dirty air filter Clean or replace
Engine not running at correct RPM Adjust RPM to engine specs with pump detached
4. Oil dripping from engine Worn seals Replace seals (covered by warranty)
5. Water in oil – looks milky Worn or broken pistons allowing water through Repair engine 
Worn seals Replace seals 


Electric Pressure Washer Problems
What’s Wrong? Cause How to Fix
1. Machine won’t start Electric outlet is faulty Check main fuse, check plug
Not plugged in Plug in
Faulty motor Return to supplier
2. Motor stops running while in use Low voltage Check voltage is within motor specified range


Other Common Problems
What’s Wrong? Cause How to Fix
1. Chemical/detergent injector not working Using wrong nozzle Insert black soaping nozzle on wand
Soap tube inlet filter clogged (hose end that sits in soap bottle) Flush with fresh water
Soap inlet valve is clogged or blocked (pump side of tube) Remove hose and use small Allen key to push through hole to remove debris/unstick the ball valve
Detergent mixture is too thick Add more water to dilute
2. Irregular bypass causing pressure fluctuations (sometimes) after use Worn or broken unloader valve seals, springs or other components Remove and replace
Unloader valve not properly installed Remove and install correctly, properly seating the valve at the bottom of the pump housing
Water leaking from unloader valve Replace worn or broken seals and re-install unloader valve to specification
Dirt in unloader Remove and clean
3. Excessive noise Water intake is blocked Check and clean or replace
Not enough oil in engine Check and add oil
Not enough oil in pump Disassemble and check (if possible) and add oil, otherwise return under warranty
4. Oil leaking from pump Loose bolts/fitting Check and tighten
Damaged parts like seals or pistons If comfortable disassemble to check, clean and replace, otherwise return under warranty

Why choose us?

At Pressure Solutions there are many reasons for why we will be your go to for all of your pressure cleaner and high pressure equipment needs, see below for those reasons.


Excellent service provided by a friendly and experienced team


Quick turnaround on repairs, servicing and new product


A high level of communication when dealing with us as a whole


Specialists in customized solutions for all your needs


Auckland wide call-out servicing (by appointment)


NZ wide sales and service through our network


Manufacturers guarantee’s on all product sold


A large range of replacement and spare parts


A solution for whatever your needs may be within the industry