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Hello and thanks for using this service, if you have been waiting do not worry or get upset I am just one of the techs on here and I try to get to as many customers as I can and I just picked up your question now. Please give me time to respond sometimes I get your replies late so there may be a delay in my response.
HEAT 2 will blink when 2nd stage is running. This means the thermostat thinks it is controlling a heat pump And HEAT 2 is the AUX heat source. SO if nothing is heating you need to get to the furnace and get to the board to check the board for any flashing error codes, there is a list of them on the panel when you remove it to get to the board. See what you find and let me know.