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If the wires from the old thermostat to the furnace are not the same colors at each end it seems to imply that there is a cable splice somewhere along the run where someone did a hack job of the splice … Write down the color relationship for a permanent record and for use in aiding you in connecting up the new thermostat. …

Placing a second parallel thermostat or moving the single thermostat to the colder room will not be an ideal solution for you. …

I reviewed the manual for your VRT 340f thermostat online. It does not appear that this unit is intended for use in a simple on/off on demand mode. … Your most logical choice may be to replace the thermostat with a different model that offers the simple level of control that you desire. …

The W terminal for a thermostat connection (normally also mated with a white wire) is the one used to initiate a "heat call" from the thermostat. … This would have been done to prevent any surprises from the thermostat when service was in process. …

You will lose the 24VAC power feed to the thermostat if you do that. … Another thing you should check is if the thermostat will run with just one of the Rh and Rc wires connected. …

It would generally be unusual to find a low voltage thermostat connected up with a large sized wire unless it was a line voltage thermostat. … If there is any feasibility to replace the 14AWG wire used for a low voltage application like this with widely used multi conductor thermostat wire please do consider doing so. …

From your picture it looks like in reality that the yellow (Y) wire from the fatter thermostat cable connects to the red (R) of the smaller two conductor cable. … The yellow (Y) wire from the thermostat is typically the conductor that is energized to call for cooling. …

The thermostat power delivered from the furnace nominally 24 VAC. If you shorted out the RED (R) and BLUE (B) connections at the thermostat you would end up shorting the 24 VAC supply in the furnace. … This would certainly render your thermostat non-operable and it would could: Blow a fuse in the furnace, Overheat the 24 VAC transformer in the furnace, Render the furnace control functions non-functioning …

Once you identify the wiring harness that attaches directly to the frame ground (or transformer connection #5) you can tie your spare wire in the thermostat cable into that harness wire. …

You may have done the very same thing at the thermostat end of the blue wire. …

The oven control problem could be either the temperature sensor or the thermostat. … In the case of the thermostat the control mechanism may be broken in an number of ways depending upon the type of control that it is. …

Then at the new thermostat connect the Blue wire to the thermostat's "C" terminal. … It is not clear what the Yellow wire in the cable bundle from the thermostat connects to at the furnace end. There is a good chance that this is connected incorrectly or not at all. …

You will have to remove that taped up wire bundle to ascertain if there is one wire in the cable from the thermostat that is not used. … If so then the it can be re-assigned to be the C function to the thermostat. At the furnace end that re-assigned wire will have to be connected in with the wires as highlighted in blue as above. …

Your furnace may very well not have a distinct connection point for the "C" wire to route off to the thermostat which is often the case in older furnace designs. …