Our HVAC Fan only blows in 'fan on' mode while heating. In other words the fan will not blow in heat mode if switched to "fan auto". Both fan on and fan auto modes work when cooling. See image below, any ideas?
I also forgot that I had the blower replaced 1 year back and am now wondering if the wiring of that could be the culprit. See this link for information on the original and new blowers.