More information is needed to be certain: What is the Interterm model number? What terminals were the wires connected to on the interterm, wire color and terminal ?
SOURCE: Intertherm to Honeywell thermostat
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.
SOURCE: Change thermostat
You have caught me without my old books, but I can tell you the orange wire is for the reversing valve on a heat pump. Almost all manufacturers, except for Lennox, are: R=Power (24volts), G=Indoor fan (Blower), Y=Cooling (A/C), and W=Heat. Some t'stat's are set up to use 2 separate transformers (24 volt), that is why you will see Rc, Rh. This is power for cooling and power for heating. If this is what you have, just take the Red wire and strip it back far enough to go under both screw terminals if the unit is a residential one. I've been doing commercial work for over 20 years and have never seen an "A" terminal, so I can't help you there. You may want to double check that. If I'm reading you correctly, I would put the orange wire on the "O" terminal. Don't understand why the "Y" terminal is not used. It turns on the compressor. The "O" goes to the reversing valve to "Tell" the outdoor unit that it is either in the cooling or heating mode.
Good Luck and let me know if I can help any further.
SOURCE: wiring in a new thermostat
yes .common as in the netural side of the transformer x to cif not hooked up the stat will still work. and honeywell has good support for their products . Tom
SOURCE: I have an Intertherm Thermostat.
As long as you bought a heat pump thermostat, then they are compatible. It should be at least 2heat, 1 cool. All the terminals should match up. The other possibility could be that you have blown the 24v transformer inside the furnace. The transformer is what sends the power to the thermostat in order for the thermostat to switch between the different settings. If that shorts out, which can happen if your thermostat power wire touched any other type of ground, you will not have any power at all. If your pretty good with electrical stuff, you can pick up a 120/24v transformer and change it yourself. To check if the transformer is bad, you need a voltage meter. Make sure you have 120 to the indoor furnace, when you find the transformer, one side will be the 120v, the other side is the 24v. Follow those wires to make sure you have the voltage coming out. This is just a few things to check, hope it works out for you. Feel free to ask more questions if needed. Good luck!
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