I have a Goodman Furnace Model GU 100-2.5, today I turned the thermostat up to call for heat, after being off since this past April. It did not fire up. I changed the thermocouple, then the thermoststat, still it does not fire up, nor does the blower start. It has a gas pilot light that is lit. There is power to the furnace from the breaker. I've ruled out all the common problems. What should I check next? Thanks for the help. Also, this is a furnace only, no central air.
Phil

Can you hear the gas valve click? Opening up on call for hear by the tstat? It will take 2, one at tstat control and another at the furnace with a ear close to gas valve listening, you can also jumper the 2 tstat wires together at the furnace that run up to the tstat