Ok so I tried to install a new thermostat, not that big of a deal, done it before) turned it on and nothing (not sure if it worked before because this is a new rent house I just moved into) Started to look at the code(led blinking light) and it said secondary voltage was the problem, I ppulled the 3 amp fuse and it was blown, cool I thought, I found the problem, this from a plumber(yea I know I should stick to what I know best) I replace the fuse with a 5 amp instead, turned it back on and blew it, I disconnected the red and white from the condensoe and tried it again with a new fuse, as soon as I pushed the door safety latch in it immediatlety blew(I saw it light up), My guess is that I have a short in the thermostat wire somewhere. Reason I think this is I feel someone has messed with it before because there is NO SLACK to pull the wires out of the wall, there is only about an inch of 5 wire that will come out of the wall. Is there a way to tell if there is a short in the T-stat wire and is there other things I should be looking for? Like maybe the 24V transformer, I was almost ruling that out because the furnace is only about 2-3 years old, Any help would be greatly appreciated, Thanks
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3 amp fuse keeps blowing