Low flow error/CFS issues

When trying to diagnose a low flow error, I always start with the PM. Check your inlet, loading, deare, and flow pressures. Next thing are the brushes. Could have a brush that is sticking or wore out enough to intermittently cause the error. You will normally find your issue within in those first few checks. Remember, CFS 10 is chamber full switch which tells the balance chamber to switch. So if its not getting enough pressure it will act funny. Not saying that's not the problem but you should start with making sure all of your pressures are correct first.