I have a two year old tempstar furnace that now & then just decides to shut down. I can get it to restart by throwing the circuit breaker or just flipping the switch on the furnace off then on again or I can lower the thermostat below the current room temp. and then when I saise it back above the current room temp. the furnace will kick in and start. The co. that installed the furnace do not know what's going on.