I've got a Shurflo backpack which I've had for about 3 years. I have bypassed the pcb and just have a simple on/off switch at the top of the backpack. Whilst this is much more convenient it does mean the pump runs at setting 4 by default. This last week or two the pump has been sounding a little less healthy, and I have noticed that the flow rate seems to be a little erratic, to the point of it just trickling from the brush. Is the pump on the way out and should be replaced? Or is it simply some new seals or something that will make it all shiny and new?
Would rather not fork out £80 for a pump but will have to obviously if that's what it needs...
(Note: the battery is less than a year old, and is regularly charged, and the backpack gets light to medium levels of use...)