I bought for my new apartment thermostat Honeywell RTH9580WF to replace my old Honeywell TH3110D1008. I watched almost every video I could find on internet "How to do it", but I couldn't fined anything to fix my problem.
I have gas heating system/cooling system controlled by one thermostat. My old thermostat doesn't require "C" wire but the new one does. My heating and cooling system are controlled by ICM280 Furnace Control Board witch doesn't have "C" terminal - the one that I need for my new thermostat.
I'm attaching some images where you can see that my old thermostat works with 4 wires - white for "W", blue for "Y", green for "G" and red for "R", also I have jump wire between terminal "R" and "RC" on my old thermostat. On my control board I have only 3 terminals: W, G, R.
My question is where should I get wire for my terminal "C" on my new thermostat? Thanks for any help. Also I'm attaching picture of the same control board as mine but different brand.