I have a honeywill furnance, about 20 years old with electonic igniter. When I turn the thermostat up, the igniter works and lights the pilot light, but it does not stop sparking, as it should. The main burners do not turn on, I presume because the igniter has not stopped firing. The pilot flame is on the thermocouple as it is supposed to be. Any suggestions on what the problems is and how to fix it?
TIA Denis