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Originally Posted by ernest3203
my furnace starts up and ignites for about 10seconds then shuts off after about 30 seconds ignites and does the same thing,im replacing thermostat,it has 4 separate buttons,cool-off-furn----fan-auto-on------thermostat----and one other butt,dont recall the function,some body told me to put the two thermostat wires together and if furnace kept running,he named some part to check.the whole unit has 5 wires and they start at +7.5---cool---fur--hi fan--fan---gnd.i don't know wich wires to hook together,the color sequence are red-yellow-white-blue-brown-green,i know this is pretty vague.any info would be appreciated
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BLUE is what you are looking for. There are two of them running in to the furnace. Before you disconnect label what they connect to. Im not sure that is needed but it will make you more comfortable when you put them back together. take the two blue wires and put them together. If furnace works then tstat is faulty. Most likely it won't and yu need a sail switch or freon would be second choice. Hope this helps you