I have an older Day & Night furnace that is used only maybe 2 or 3 times a year. It just started to behave a little strange. It turns on just fine in the evening. It completes a full cycle, bringing the house to the temperature set on the thermostat, and then it doesn't start again when the temperature in the house goes down. I can try to start it the rest of the evening and all of the next day, but it will not start. Until evening. Then it will run for one cycle only, again. When I try starting it other times, the igniter does not energize. If I short the R & W anytime, the igniter works and lights the pilot. Is there possibly some obvious thing I need to do or part to replace to fix * Any help would be greatly appreciated!