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Web the thermostat clicks but nothing happens. Regardless of the setting of. Web a recap of why the thermostat says heat on but no heat comes from the furnace and what to do. This might be because your thermostat is actually on the wrong. Web when your thermostat says “cool on” but there’s no air, it could be due to issues with your hvac system like a. Web what are the common reasons behind the thermostat saying heat on but the furnace not working? First, check if the power. Web if your thermostat says “heat on” but there is no heat, there may be a few possible reasons.