I have a Hotpoint Aquarius WF541 that has started making ean extremely loud noise when on spin. The machine remains still, but sounds like a jet engine. The drum makes an awful noise when I turn it manually leading me to think the drum bearings may have worn out. How do I replace the drum bearings? Many Thanks

What is the model number? Look inside the door area.

more than likely the rear bearing has gone bad and when a load is applied the difference in weight distribution causes the knocking.

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Does it vibrate?

Sounds loike the main drum bearings have failed.
Spin the drum by hand from the front, and if it feels rough, or is rumbling or grating, then the main bearigs have failed.
Quite an expensive repair, unless it is covered by the Hotpoint 5 year parts guarantee, check with Hotpoint.

bearing gone cheaper to buy a new one

half way through the cycle all the lights start flashing then it makes a loud noise when spinning

Several possibilities for noise. check concrete balance wieghts at top and bottom of washer, make sure they are not loose.
Check drum restraint spring(s) are not broken.
Check suspension legs for wear.
Check for loose motor fixings.
Finally, remove drum belt, and spin drum by hand, tjhere should be noise from bearings, if it feels rough or is rumbling , then main bearings have failed.
Please rate my comments.
Thanks.

My machine is just over 3 years old and although there is no play in the rear drum bearing it is very noisey on spin.
It gets progessively loud the faster the spin speed.

I had the same problem and it turned out to be the ballast securing bolts had sheared off and the back of the drum had to be replaced

appliance sounds like it has bearing failure.common on this machine.advise looking for a new machine.sorry