we had one of them at the old farmhouse, coal burner converted to oil. i"m not a furnace guy, but if i remember ours would do the same thing. basically when the thermostat calls for heat it sends a signal to a temperature probe that is located in the firebox, kind of a square box the size of half a cigar box, there is a bi-metal probe that goes into the fire box. that controls the burner cut in and cut out temmperatures. there may be a reset button on there. pull the box and probe out of the furnace and blow all the soot off of it. there should be a dial on it with two arrows, one for cut in temp, one for cut out. the wires from there go to the solenoid to turn the main gas burner on. should be that big diaphram thing in the photo. that opens the gas valve for the main burners. if that furnace hasnt been cleaned in a while, open the big door afeter you shut the power and gas line off, vacuum that thing out real good. probably full of soot. there should be an air adjustment shudder to regulate air flow to main burner to adjust the flame. should have a good blue flame, if it got a lot of yellow flame, you need to adjust the air a little. you want a blue flame with just a little yellow on the tips. could also be the solenoid on the main gas valve is sticking too.
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Today's Featured Article - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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