I ended up paying for it because the warranty clearly states only certified professionals are to perform repairs
That was a very expensive way to learn a lesson. If ever there is anything at all wrong with an HVAC system, call a professional to have it repaired. This seems like common sense to some degree. I just get anxious about repair costs so, I feel like I should at least have a look first. The household budget can use any help it can get. That’s why when the furnace went down, there was no way I wasn’t going to at least have a look. I’m no master mechanic but I was raised by one. My old man worked on airplane engines and had extensive mechanical knowledge. I hung around him all the time so there was a bit of a sponge situation there for me. The weather hadn’t gotten cold, just chilly at night. So, the furnace being down was a choice. I knew nothing about furnaces but I understood them enough to make the mistake of taking that look. It took a few minutes but I found a part which had clearly failed. It was just an easy replace part repair. I got the part online and it came the next day. I put it in and the furnace worked just fine. That lasted a few weeks before that part failed which in turn caused the furnace to fail. I mean completely done forever fail. I ended up paying for it because the warranty clearly states only certified professionals are to perform repairs. That will never happen again but it should never have happened in the first place.