I am having Carrier AC (Probably 30 year old), when I press relay switch it start running. I can see current (24VAC)is coming good to relay switch (from thermostat). Weird problem is sometime AC start working properly and mostly no.
Recently, when I removed and reconnect wire between timer and relay, I noticed quick release on relay. After that AC started working. On next day, it didn't turn on. I am kind of wondering, what ...