We changed batteries in our thermostat when the blinking battery icon came on but the icon never stopped blinking and we don't have any heat. The fan comes on but nothing else. We purchased an new thermostat (same model) and no change. Same blinking light. What does this mean? Is it a thermostat problem? A wiring problem? Or, God forbid, a heater problem?

I appreciate any feedback you can give me. LeslieBN