"Harry Bloomfield" wrote in message
...
Brian Gaff has brought this to us :
Probably either the intermittent sparking or the spring tension or length
of the brush. Normally though if you let them go too far the comutator
starts to get eroded away, so best to swap them. In old vacuums they had
a similar thing, but you don't see it these days, probably cos they are
chuck it away and by a new one merchants.

I checked all of that, not realising what the LED meant - it was all fine,
good brushes and perfect com.. The red LED came on soon after purchase,
comes on as soon as power is applied and remains on like the green power
LED.

My best guess, is that it checks and compares resistance through the
brushes and com. and should light up if its too high. It must be a false
indication, so best ignored.

I'd be making a warranty claim myself.