HELLO, JUST CAME HOME IN NJ TO FIND HEAT NOT WORKING. FURNACE IS A RHEEM CLASSIC 90, MODEL#rcba-3765gg21x1. Have power to unit, breaker is on, when I depress covers interlock switch, LEDs light briefly & I can hear what sounds like a burner starting. Blower does not come on. Verified Thermostat is on; set fan to ON, no change. Any suggestions ?