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1 pointHello Barry, it seems the majority of new washing machines have sealed outer drums now. The symptoms you describe are classic drum bearing failure. The brown rust marks at the back are caused by water leaking into the bearings through the drum bearing seal. In my experience Hotpoint have always had rubbish drum bearing seals. Drum bearing failure has always been a very common issue. I would never buy a Whirlpool, Hotpoint or Indesit appliance. To be honest, there are very few of the common brands I would buy.
1 pointControl board is at the bottom-back - you access it by taking off the back panel. It also has a small ‘piggy-back’ board clipped onto it called ‘dryer unit’ Ive just sent my board to QER to see if there is anything they can fix, although there are a lot of small chips and surface mount components, so I’m not super hopeful, but worth a try. A new board from Bosch is £150 will update once I get feedback from QER