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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.
Can you adjust it and set it to a temporary hold to see if it turns on?
Ok you may have a bad thermostat can you get at the wiring to the thermostat and connect the Red and White wires together to see if the heat comes on?