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you have a 24 volt shorts check your thermostat wires to see if they are frayed or if they are touching anything. Check your outside wires also go to the thermostat.
If your diagnostic indicator is not picking showing a fault code than it thinks everything is ok with the furnace. It could be a bad thermostat. (or the heat anticipator in the thermostat).
If there are only two wires going to the thermostat? Then you will not be able to use a Digital Programable stat. Intertherm and Coleman furnaces do the switching different than regular furnaces. They use the switching from heat to AC at the furnace with the rocker switch. They use the thermostat to either break the connection or make the connection. They use a heating only thermostat.... Hope this helps
Typically if you have a yellow wire in the "y" terminal blue is used as common or "c". As far as your jumper from rc to rh, that will depend upon what type of heat you have. If all of your heat and cooling come from your packaged unit outside, yes you will need the jumper. If this does not work maybe you have a bad breaker or transfomer.
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