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Hi I'm Brian and I'm here to help!
Can you clarify your situation a little more for me please? You say: "When I don't hook up the "C" or blue wire and turn on the power, there is nothing happening on the thermostat", since the Honeywell RTH6350D doesn't have a C terminal, where are you hooking up the blue wire on the Honeywell thermostat? Also, did you make sure you installed the batteries correctly?