You seem to have difficulty reading. If I'm any judge of character it's because your mind is chock full of pure knowledge.
I told the service man what the problem was. He asked me how I knew. I told him about the thumb on the transformer. He told me I was right.
The service man told me he'd have to order it and his price would probably be a lot higher than what I'd found.
I called him early on a Wednesday afternoon. He worked me in about the middle of the next morning.
It was hilarious. My neighbor's air had gone out Sunday. He'd called Monday. The reason the service man got to me in less than
24 hours was that he had to come to the neighborhood anyway, for my neighbor, who had called 72 hours ago.He came to my house first! My neighbor didn't think that was fair. Then we shot the breeze half an hour as my neighbor paced his yard across the street. Then the service man drove off without stopping at my neighbor's! Eventually he came back and told my neighbor it would cost him $8,000 and he couldn't get to it for a few days.
My neighbor was already pretty mad, so I lied. I told him the service man had fixed mine and the temperature in my house was so low I had to wipe condensation from the outside of my windows to see out.
I used to have it serviced. I'd paid $300 for a new board in 1992 and again in 1995. When the board failed in 1998, I realized if I wanted it done right, I'd better do it myself.
I could see that the factory service center had used zinc chloride when they replaced the SCR. They hadn't washed it off. It had drawn moisture from the humid air, which created acid, which ate the traces. I was amazed at the cascade effect of the malfunction: SCR, relay, rectifiers, snap diodes, a 32-pin DIP IC, and stuff I don't remember.
The manufacturer treated the schematic as a secret, but as you probably know, you can go online to get the specs for the components, then use a dual-trace scope to find the problems. My repair certainly outlasted the factory repairs for 1/10 the cash outlay.
I live in a town where people haven't had good experiences with HVAC service.
I think you're a winner, too! If I'm any judge of character, your contempt comes from having to deal with people who know much less than you. I'll bet you do first-rate work. If you would post your phone number, I could recommend you to my neighbors.