blower will not start
I have a 8 year old heil forced hot air furnace, It will run once and if you start it up again before 15-20 minutes the blower will not start unless you switch the thermostat to "fan on". I have to keep the thermostat set a swing of 1.5 degrees. Help!
It sounds like you have an electrical problem that needs to be tested and diagnosed at your home by an electrician, not on a message board. Your blower could be bad, a capacitor inside the blower unit could be bad, a wire inside the blower unit could be fried, a connection could be loose, or a circuit breaker (either at the subpanel or the main panel) could be bad (which would provide some but not enough power to the blower).