It’s never a nice thing when you can tell that a piece of unit has a death sentence.
Some appliances plus electronics, such as a desktop kindle, have distinct sounds that are made by parts of the inner workings that essentially say “I’m about to cut down for good”.
When my desktop kindle started making a clicking sound that came from the hard drive, I knew it was about to be toast! The same goes for a heating system, love a heating system or a boiler. About a year ago actually, I had to deal with the coming end for my boiler system. I knew this, because I was in the basement 1 afternoon as I heard the distinct sound of “kettling”, and kettling is a term for when there’s too numerous mineral deposits inside the boiler tank, plus it causes the boiler to no longer create heat in a stable environment. Kettling is also something that can lead to the boiler cracking, plus once that happens it won’t work at all. So, once I heard the boiler making that noise, I immediately made a note to call my typical heating plus A/C repair supplier for a visit. When the workers came to my place a few afternoons later to check out the boiler, they were in agreement with myself and others that the boiler was genuinely on its way out! I was sad to see it go, as that boiler had been in the new home since before my family plus I moved in! However, we had to find a new plus equally reliable heating system.