Typical problems when a high pressure cleaner is defective

Apart from leaks, material wear, power supply and leaks, a pressure washer can have a mechanical, hydraulic and technical defect. Typically, the unit no longer starts, does not build up pressure, does not switch off, pulsates or stutters. Rough running is sometimes comparable to that of a petrol engine.

Leakages and leaks

Lance, gun and hose can leak and become clogged. These defects can be detected externally and countered with sealing and cleaning. It is more difficult with “internal” defects in the technology. Since it is a mechanical movement with springs, pistons, rotation, valves and compression, diagnosis is not always easy.

Diagnosis and repair options

Does not start any more

  • Power supply is not guaranteed (broken cable, fuse, plug, extension cable defective)
  • Nozzle, gun or jet pipe blocked
  • Main switch defective or pressure switch jammed
  • Pump motor broken
  • Motor is overheated and activates protective shutdown until it cools down

More on the topic: Pressure washer won’t start

No longer switches off

  • Leakage or leak in the gun causes backpressure, disconnect from power immediately
  • Leakage or leak in the hose, disconnect from power immediately
  • Air and dirt in the pressure pipe and/or the gun, remove and flush out

More on the topic: Pressure washer no longer turns off automatically

Builds up too little or no pressure

  • Power supply interrupted or voltage too low
  • Ensure sufficient water supply, open tap completely
  • Water supply line has too small a cross-section (at least a quarter inch = 19 mm)
  • Filter screen on the connection pipe for the pressure pipe is clogged, clean or replace, can also be located elsewhere (water inlet side), which can be seen in the operating instructions
  • Gun nozzle or opening clogged, prick with needle

More on the topic: Pressure washer does not build up pressure

Unit running and water pulsating

  • Dirty valves, loosen the hexagonal screws, remove them, clean them with compressed air and replace them if necessary.
  • Dirty overflow, pull out the component under the pressure adjustment, clean, grease and refit it
  • Too much air in the system, disassemble, bleed, reconnect to water supply
  • Water supply line has too small a cross-section (at least a quarter inch = 19 mm)
  • Ensure sufficient water supply, open tap completely

If the drive and unit run stutter, the causes are usually the same as for pulsation and insufficient pressure build-up.

More on the topic: Why does my pressure washer keep pulsing?

If you soak the gun in vinegar water after about every twentieth use, check the filters and clean them if necessary, the susceptibility to defects will be significantly reduced.

Alfred Harper

Alfred Harper

Alfred Harper is a former consultant and product expert at a company producing cleaning equipment. He was working at this position for more than 10 years and has gained incredible experience and knowledge as he has tested almost all pressure washers brands and models and became an expert in this field. Now, he is writing reviews and how-to articles about pressure washers and makes a great contribution to the Pressure Washers company to help people to choose the best cleaning equipment for home use.

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