I am trying to change a faulty thermostat and the old one had a red wire connected to terminal rh with a jumper to rc, and a white wire connected to w with a jumper to y. The new thermostat I bought (cheap replacement) only has terminals w r g y. Will this thermostat work? I have tried hooking wires only to w & r, and also to w & r with jumper between w & y. The unit is in a mobile home with electric heat with central air unit. Thanks