Why is my pressure washer blowing fuses?

pressure washer service enginner repairing a broken karcher pressure washer

pressure washer blowing fuses

I think you will agree, there is nothing more frustrating than your pressure washer blowing fuses. Find a screwdriver, go hunting for fuses, complaining wife because the kettle wont work… Hopefully some of the suggestions below will help you solve your little problem.

A common question we get asked is why is my pressure washer blowing fuses? There are many reasons why your pressure washer is frustratingly blowing fuses, or the thermal trip is operating.

Are you using an extension lead? If you must use an extension lead, then it must be a minimum of 2.5mm on each core, and I recommend that it is no longer than 10 meters.

On industrial pressure washers using a blue 16 amp plug and socket is recommended, and are these are less prone to damage too. ALWAYS USE AN RCD. This goes without saying.

It’s always better to use an extension high pressure hose rather than a lead.

ALWAYS pull the trigger to dispel any trapped pressure in the hose before trying to turn the machine on. (It’s like trying to start your car in 3rd gear otherwise, its virtually impossible, you wouldn’t do it to your car so don’t do it to your pressure washer.)

Is the lance nozzle partially blocked? I’ve been to plenty of pressure washers on site that are blowing fuses only to get there to find that the nozzle is blocked with crud.

Is the supply voltage correct? If it’s dropped because the electricity board hamsters are not running fast enough then the main motor will pull more current as a result blowing fuses in the plug or activating the thermal trip.

All the industrial pressure washers we sell have big motors fitted to them, that require the correct electric supply at the machine, if it’s not right the machine will let you know its unhappy. Either by flashing lights, or by smoking the motor in spectacular fashion!

The bottom line!- 95 % of the time, blowing fuses etc. is down to operator error. Bit harsh but true!

Still blowing fuses after all of the above? – Remove the high pressure hose and turn the machine on. Buzzing noise then the fuse pops? – Call your local pressure washer specialist for help.

If you have an ammeter for measuring the amount of AMPS ,(current) the machine is drawing then it’s always good to know this figure, or get a qualified person to do the test for you.

Machine blows fuse in between normal running, shutdown then restart.

Most probably caused by that little leak you’ve been ignoring. Basically the motor is restarting because of the pressure drop, but because the trigger is not open , this overloads the motor causing the fuses to blow. Fix the leak. Sometimes the leak can be internal inside the pump or bypass valve, call your local specialist.

Always seek expert advice when dealing with your expensive industrial cleaning equipment. if you are in Somerset or Dorset then give us a call on 01935 411876.

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