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I just replace a Honeywell T87F28733844 Thermostat with a Honeywell RTH221 Thermostat since then my the furnance will not produce any heat. I replaced the thermocouple, but still no go. The pliot light is lit, but still no go. The wires that went to the T87F are yellow, green red and blue. The RTH calls for a yellow, green, red, and white, with a jumper jack in the Rh Rc. The blower for the fan works, and the ac works, but not the heater

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  • charlwoo9 Oct 06, 2009

    Hey, thanks I went and brougth another theomstat and I do believe that I just had my wiring wrong. I wired it according to the colors, but I think that I took one color to be another, and I was not sure where the blue wire should have been connected. I'm in the process of rewiring it now, but still you provide some good information.

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The heat circuit uses 2 wires to the thermostat one is the power from the transformer, and the other goes to the gas manifold.

The Rh and Rc is probably the power for heat and cool, and this is where the red would attach IF the red wire is the power wire from the transformer.

open the unit and look to see what color goes to the gas manifold. If you have it wired correctly, the problem could be either a blown fuse (if equipped with a fuse) or a bad gas manifold.

You can check the manifold by either using a ohm meter and check the manifold coil or by applying power directly to the manifold from the transformer.

Disconnect the wires from the manifold, and use a meter to see if the coil is good or use 2 jumpers and connect them to the manifold and see if it opens

Posted on Oct 04, 2009

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