I have a GE natural gas central heating unit. I'm not sure how old it is, but it could be as much as 25 years old. The pilot is lit. The digital thermostat inside is getting power. It shows the correct inside temperature. Earlier in the season it worked properly. During the last cold spell, it didn't cycle on when the set temperature was reached. I thought perhaps the pilot went out, but it didn't. What should I check next, and how? :mad: :confused:

First do you have a/c on the furnace if you do try turning it to fan on see if the blower comes on that will tell us if you have 24 volts and that you have 120 volts to the furnace also make sure your blower door switch if you have one is pushed