First time post, but I've been lurking! I spent some time researching my issue, but couldn't find an answer.
I live in PA, and we had a warm weekend, so my New Yorker boiler didn't work much over the weekend. Well, when it got cold again on Monday, it wouldn't come on. Hmmmm so I started looking at it. The boiler also heats our domestic water, and that was hot. When we moved in I switched out the oil burner for a Carlin gas unit, and it's been working great. Being that we had hot water, I knew the gun wasn't the issue. We have two zones in the house, one we never use, it's the attic. But when I turned that thermostat on, it fired up no issues. This led me to the Aquastat that controls the entire house (minus attic).
I started searching online, and sure nuff, I was in the right area. My thermostat is a Nest and it showed that it wasn't getting power on the white and red wire. My meter confirmed that there was no power at the Nest (upstairs) or at the terminals inside the Aquastat. (yes I had it on AC). Out of semi frustration, i whacked gently the Aquastat, and wala! It fired up, heated my house until Wednesday. Well, I'm back here, it's stopped working again.
Wednesday night out of a panic I ordered a transformer, it will be here today. But further reading suggested that these transformers are usually the last thing to fail in the Aquastat.
I would like to get your input, what to check. The solder joints look ok. I have 120vac coming in. If I move the relay by hand, it fires up and then stops after 3 seconds. Am I crazy for wanting to replace the transformer, I didn't find one post on this anywhere, but seems simple enough.