This heat pump dryer was imported from Germany by the owner who is British relocated from Germany to UK. The machine ran for less than 5 mins then the clean filter alarm came on.
I checked the filter and it’s clean. It’s self cleaning condenser although I take it with a pinch of salt and I had a look at the condenser which it did have some small amount of fluff but not significant to cause blockage.
Do you have any directions that I need to look for and how to resolve it?