I was fairly certain the only thing wrong with my furnace was the control unit, however I couldn’t be genuinely certain… I went online and did a search about control units.
I asked the question, ‘What happens when the control unit breaks?’, and got a lot of answers… The main thread of the answers is that if the batteries in the control unit die, or the control unit malfunctions, it can no longer communicate with the heating, ventilation, and A/C system.
This also means the furnace could continue to run or won’t run. If you have the air conditioning system on, it won’t reach the desired temperature, or it could freeze you out. It was funny to believe the control unit could be the brain of the heating, ventilation, and A/C system. This really made me wonder what happened before they had control units. I should have known it would be the same answer, without the control unit, people had to manually adjust their temperature… You learned how much coal or wood you needed in the furnace to keep the apartment moderate separate from getting it too hot. I don’t know about the air conditioning system, because my mom and Mom didn’t have an air conditioning system, but that didn’t matter. I was now even more sure that the only thing wrong with my furnace was that I needed a current control unit or current batteries at the genuinely least. Instead of calling the heating, ventilation, and A/C business, I changed the batteries, but nothing happened. I then went to the neighborhood and bought a current control unit just like the digital control unit I already had. When that didn’t work, I was deflated. I was now going to need to call the heating, ventilation, and A/C business.