I have a Carrier Weathermaker 58SX furnace. I set the wall thermostat to "heat","Auto", and turn it up to 80 and the furnace never kicks on. When I turn it to "On" instead of auto, the furnace will blow out air but it's not warm. I realize that I have no pilot lit, but I just replaced it 2 years ago. Could it be the pilot setup is bad again, or is it possible to be something else? Thanks
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Re: problem with furnace, air but no heat
The hot serface igniter may nead to be replaced again . if the is a lack of air
[ have this checked} getting to and frome the furnace it may be causing the furnace to cycle off the burner duing call for heat. it recycles back on and off untill the thermostat is saticfied. this means you are reusing the igniter more often the once a call for heat . therefore shorening it life expectancy.. make shure you are not blocking the air flows with over filtering ..whitch i have found to be the most common mistake . this and not changing or cleaning air filters often enough.
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You need more information to get the size. The Carrier 58sx series includes 5 different models: 40 - 41000 BTUH, 60 - 61000 BTUH, 80 - 81000BTUH, 100 - 102000 BTUH, 120 - 122000BTUH. An installation guide for the 58sx is available here: http://www.xpedio.carrier.com/idc/groups/public/documents/techlit/58sx-14si.pdf . The Carrier 38tg has 6 different sizes (020 - 20,000BTUH through 050 - 50,000BTUH). The other sizes are 025, 030, 035, 040 and the capacity is that number multiplied by 1000.)
To determine your model's capacity, look at the full product number. The first three numbers after the 58sx or 38tg will indicate the nominal capacity.
If you're sure the igniter is good and the controller is sending voltage to gas valve to open, but not to the igniter then, yes, the controller is bad. The only way to know for sure is to remove the igniter's molded plug from the board and test voltage directly at the board. You should get about 100-120 vac to the igniter.
Hi and welcome to Fixya. I believe that the wind is affecting the draft. What I would recommend is to install a cap on the flue that is similar to a weather vane in that it rotates to block the wind from creating a downdraft in the flue. Some times depending on the direction and strength of the wind it will come up over the roof peak and then down the flue. A regular fixed cap may work too. You should be able to purchase one at your local hardware store. Please let me know if this was helpful. Good luck.
Is this a gas furnace if so is it high efficient if so is there an led light on the furnace blinking a code usually seen through a window at the furnace. is the thermostat battery operated if so is it a new battery and are the aif filters new. These would be my first steps to check hope this helps
Remove all power from the furnace, it is likely the brain in the furnace is need of being reset, from the battery replacement, why did you change the battery, was there an indicator telling you to change it?
Many times just removing all the power to the furnace will do the trick with a reset, if not let me know and we will go from there, but it sounds like the main brain is confused or bad, more likely confused, so try the power removed first.