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If you look the model/part number of that thermostat you're looking for on the internet, you should be able to find a PDF file of the owners manual to look at the wire diagrams and it will also let you know if the thermostat is compatible with your current set up with the oil heating and central a/c w/3 zones. RC & RH should be explained in the thermostat manual if the new thermostat wiring has been reconfigured to accommodate your setup. Hope this helps.
Do you have a model number for the new and old thermostat? Do you have a split system? This means you have a heater in the house and a condensing unit somewhere outside of the house. Let me know if you have a packaged unit or a split system and we can go from there. I might just be a blown fuse on you board, but I need to know what you have so we can start to trace things out.
if you have a programable tstat you need to go through the settings for each day and time. usually the buttton will say prgm or program sometimes it will be set try to get into the settings menue and then you can adjust times
Go to www.honeywell.com and search their data base for your model of thermostat. You wil need all the numbers of your thermostat to be able to search. Once you find it, download the installation manual.