Hi, my name is lewis. I have aa rheem gas furnace about 25 years old. It will NOT fire up. The pilot light is on. I changed the thomacouple but no flame. Can you help me to get it to fire up?
Thanks,Lewis

Check and make sure the power is turned on, (breakers on, fuses good), thermostat is set for heat look everything over and make sure all wires have connected and tight, if you have a multi-tester you can check to see if you have power going to gas valve and power going into and coming out of the transformer