Common Pressure Washer Faults Published 14/03/2007
Pressure Washer Does Not Start:
- Blocked lance or jet – clear any obstruction in nozzle, and you can find out how to do this in our “Cleaning a Pressure Washer Nozzle” article.
Pulsating Pump or Pressure Fluctuations:
- Inlet filter blocked – check and clean the pressure washer’s inlet filter.
- Internal tubes or valves could be worn – contact a qualified engineer to carry out the required repair.
- Hose too long – replace it with a shorter hose. Ideally, to prevent pressure loss hoses should be no longer than 30m.
Low Flow Rate and Chemical Injection:
Try the following steps:
- There could be air in the system. Try turning off the pump and holding the trigger open for a few moments, before turning it back on. If this does not fix the problem, continue to steps two and three.
- Check the water supply tap is open and the inlet valve is not blocked.
- Check if the nozzle on the lance is blocked, you could also try a new lance nozzle.
No Pressure (Pressure Washer Doesn’t Reach Operating Pressure):
- Wrong mains voltage – check the mains voltage corresponds to the specification of the machine.
- Plug not connected – connect the plug.
- Defective socket – try another socket.
- Fuse blown – change the fuse.
- Defective extension cable – try the pressure washer without the extension cable.
- Thermal switch tripped out – leave the unit off for a few minutes. If the switch does not reset automatically, or continues to trip, contact a qualified engineer.