I have a Rheem Corsaire gas furnace that is giving me problems. When I turn the thermostat up it cycles on, exhausts the gas, the igniter warms up, the gas comes on and the burner lights. It stays on for about 15 seconds before the gas stops and the flames go out. If I leave it on then the blower motor circulates cold air. The cycle will continue with the furnace continually being cold and blowing cold air. I have cleaned the electronic eye sensors (3 of them - one left, one right, and one looking down). without any change. Do they have reset buttons? Can the entire system be reset?
Can anyone help me with this problem?|||You have a bad flame sensor. It is a metal rod with a wire attached to it in direct contact with the flame. It should be in line with the burner farthest from the ignitor. It is a real pain to get out but you can take it out and scrub it lightly with one of those green dish scrubbing pads(definitely not sandpaper). Put it back in and try it again. If it still will not prove flame you will need to replace that flame sensor. BTW the copper thermocouple is for use on standing pilot units that do not have ignitors and maintains the pilot lit. You don't have this type.|||There is a thermocouple that tell unit flame is on. If it goes bad this will happen.
It looks like a very small copper line that goes into the fire box. Buy and install a new one you should be ok.|||b
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