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Give me model on thermosat and furnace
OK first step is to determine if thermostat is issue or issue is in furnace.To do so, remove thermostat wires at thermostat and twist R and W wires together.If heat comes on and works we know thermostat is the problem.Ignore phone call offer if you are not interested. No problem
Ignore phone call request.WE can continue here as long as it takes.