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The thermostat wire is shorted. Somewhere between the thermostat and furnace. Replace the wire and make sure its connected correctly. This is an older furnace. Not sure what the thermostat wire connections to the furnace look like. Sometimes if one of the wires touches a ground this could happen. So, start by completely replacing the thermostat wiring.
there isn't a summer switch - the thermostat will switch the operation from heat/winter operation to cool/summer operation. I.E. "Cool" for Summer and "Heat" for Winter.
It's a flame sensor.It looks like size of regular welding rod and have one wire connected to it.you have to removed and clean with 1000 grid sand paper and put it back on, that's all..
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