Pressure washer (Clevedon BS21)

Champion brand 1300w, 100 bar pressure washer, needs mains mains water and electricity to function.
To use it successfully, before you turn on the power switch on the unit, you must have the water lance trigger pulled, if you let go of the trigger while washing and then try and press the trigger again, it will not flow water, it will sulk for half an hour before it works again. If you keep your finger on the lance trigger while using the electric power switch on the unit, it works faultlessly.