I had a Nibe 640P before this. It had broken down almost every year for some 5 years before it finally gave up this year: it started leaking, several parts were not working anymore according to the technician and according to him, they couldn't even buy anymore some of the parts (the machine was only about 15 years old!)... so I didn't have a choice but to replace it... the previous times I fixed it cost me between 4K and 10K SEK (change of some electrical component or sensor that broke, replacement of the actual ventilator a couple of times)... If I could keep fixing it reliably I probably would... but these days, after 15 years every technology changed so much that what you've got becomes a museum piece that can't be fixed. Same thing happened at almost the same time to my alarm system :( Sektor Alarm didn't even offer to fix it up... it was using 2G which apparently is slowly dying in Sweden. At least they got me a very good discount and I spent "only" about 5k SEK to get a very modern alarm system with cameras, vibration sensor, mobile app and bells and whistles :). But again, I'd rather just keep what was working if I could as to me it feels like a huge waste to throw away so many electronic components which are mostly working just fine... however, you just can't do it anymore.