Question about Heating & Cooling
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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Posted on Jan 02, 2017
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