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AC Air Handler Transformer - Smoked?
So Monday I had what I suspect was a bad thermostat causing intermittent cooling problems and being fundamentally lazy I tried to swap out the thermostat without throwing the breaker (please note that lecture is no longer needed!).
Long story short is that there is now no voltage present at the thermostat. Unfortunately the air handler is in my disaster of an attic (low pitched roof w/ AC hoses running all over like a plate of spaghetti). The is a really old AC system w/o so much as a control board; really just a transformer and I guess a fan relay (no heat in the air handler, I have BB Hot Water). No separate fuse that I can see anywhere in the control cabinet but the transformer secondary has a button which I suspect is either a breaker or a fuse which I have attached a picture. I tried pushing the button but nothing happened, still no 24v from the secondary. I did verify that I have 240v on the primary and the transformer does the normal barely audible hum when powered on.
I stupidly left the transformer in the cabinet (the heat was getting to me and my judgement was not to be found). I am hoping that someone will recognize this button and explain how to simply reset or replace a fuse. One can hope, right?
Should it matter, the air handler is an old Lennox unit which I guess is 25-30 years old (I have lived here for 21 years).