Pressure Washer Troubleshooting and Repair Guide

Pressure washers save time and effort when cleaning cars, patios, and equipment. It's crucial they function correctly. Here are common issues and solutions to keep your pressure washer running smoothly!

No Water Pressure (or Very Little!)

If the machine starts and runs well but there's little or no water pressure, check for blockages in the wand, hose, or inlet filter. Connect a water hose to the washer's inlet and turn it on. If water flows out, the inlet is clear. If not, clean or replace the clogged inline filter. If water is flowing, start the engine and connect the hose and wand. If there's still no pressure, the hose may be kinked or the wand could be blocked.

Pressure Washer is Losing Pressure

Common causes include a blocked nozzle or water inlet, insufficient water supply, or air in the inlet water supply or pump. Ensure the water supply is fully on if the pressure is pulsing. Also, check that the hose isn't kinked or pinched anywhere.

Water is Leaking From the Wand

Leaks often occur where the wand connects to the hose, leading to pressure loss. Inspect for cracks and replace the wand if necessary. Check the rubber o-rings for wear; replace them if they're cracked or old.

Water is Leaking From the Pump

Before using the pressure washer, purge any compressed air from the pump. A leak can prevent pressure from building. Pump the handle until water flows from the wand before starting the engine. A defective thermal release valve can also cause leaks. This valve allows pressurised, heated water to exit the pump if the machine runs without squeezing the trigger. Replace the valve if it continuously leaks water.

No Water Coming out of the Lance

A blocked nozzle could be the issue. If the lance is leaking, check for splits in the plastic or broken seals due to wear. Ensure the lance is properly attached and avoid dropping it. Store it correctly in the pressure washer's designated slots and hangers.

Engine Won't Run

For gas-powered pressure washers, ensure there's enough oil and a spark. If the engine still won't run, the carburettor may be gummed up with old fuel. Open the drain plug on the carb and let out some fuel. If it still doesn't work, the carburettor may be blocked. Remove and clean it with carburettor cleaner, preferably under supervision.

Pressure Washer Pump Failing

Cracked or frozen components often cause pump failure. Running the pump without water can also lead to damage. Store the pressure washer indoors to prevent freezing.

No Water Flowing but Strange Noises From Pump

If the pump makes strange noises but the pressure washer starts and runs fine, it may have been improperly stored. Always drain water before winter storage and consider using antifreeze. Follow the manufacturer's instructions for winter storage. Leftover water can freeze and expand, damaging the pump, which may require replacement.

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