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If you have a heat pump you need a thermostat with the O/B terminals. if your outside unit runs a lot in the winter you have a heat pump.
Your new thermostat may be good for both a heat pump and a conventional system, look for that in the directions, if it does not have options for a heat pump and show the O/B terminals its the wrong thermostat.
Let me know what you find, we can go from there.
Hello again, I am not at all familiar with that trotemp sub base, and have never seen the standard O/B nomenclature mentioned unless it was in context with a heat pump system, but I suppose it could be employed that way... double check that so far it does not seem right to me.
Meantime I will opt out in case one of our other experts here is familiar with your situation.
Good luck with it.
hi, i am dan i can help you with this, you need a thermostat with a separate O and B terminal the C terminal is not too important but the thermostat for your system will not work as the master. you can use it for the slave thermostat.