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No heat new thermostat

I have a Carrier heat pump system with emergency heat (2 zone). I came home, my thermostat screen was blank. My HVAC buddy said open the door on the attic unit and check the fuse. Sure enough, the 5 amp fuse was blown. I replaced, the screen came back on. When unit kicked back on the fuse blew again. I had no mre 5 amp fuses, only 7.5 amp or larger. Buddy says put in 7.5 it should run ok. I did this, heat is on and running. 2minutes later thermostat is smoking. I rip it off the wall, yank out fuse. Thermostat was literally burning(the part that controls temperature up and down). This is a Totaline nonprogrammable stat. I go out and buy new 5 amp fuses and a new, this time programmable stat. Honeywell RTH7500. I following the directions on how to wire the stat. I then go to the advanced setup and answer each multiple choice question. When the question "select system type" I intially chose Heat/cool multiple stage. I have a heat pump with a/c and heat with emergency backup. I started the system, and could only get ermergency heat to run. It would not kick on the heat pump. So I reprogrammed it and chose " heat pump with aux heat". Now the heat pump is working. I run it for 2-3 weeks, no problems. Now I try to set the program schedule to the default settings, which is 62 at night and during the day and 68 in morn and evenings. I wake up the next morning, nothing is coming on. Stat is lit (Though this one has battery backup). I open attic unit, fuse blown again. This led me to believe that the wire from attic to emergency heat has short, because the temp difference was 4 degrees, which I believe tells the system to use aux heat to catch up. I get a new fuse, put it in. I turned off the schedule, and went back to manual settings. I turn on the heat, "wait" appears on the screen. Then after a few minutes the fan will run to cycle the air but no heat pump or emergency heat. (I set the temp only 1 degree above room temp). Fuse is not blowing, but only fan is running. "wait" stays on screen. What the heck do I do now? Also, my buddy said because I think the aux heat is the reason the fuse is blowing, to detach the aux wire from the stat so it wouldn't blow the fuse. I even reprogrammed the stat for heat pump only on backup. Stil same deal, no heat no backup, fan runs and screen says "wait'. Please help if you can.

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You have a short in the wireing.disconnect at air handler and hook-up short t-stat wire to t-stat,ifok chk wire to condenser

Posted on Jan 10, 2009

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