Furnace runs for 8 minutes at a time.
This is driving me nuts. For the past few months, my furnace has adopted this annoying feature in that it only runs for eight minutes at a time. To make it run more, you have to turn the thermostat ...
Forum Discussion
RobG wrote:
The whole furnace shuts off after 8 minutes.
Fan control board ? Um... other than the Dinosaur board, no idea. I know there's a connection on it for the Blower.
It's an NT-30SP now that you mention it.
The box the board came in says FAN50PLUS. This is the same board that's been in it for two years and it was working fine until recently.
OK- that is all good. Does it actually light? The eight minutes is about the time a fan control board (the Fan50Plus) will run before shutting down if the flame is not sensed. If the burner is igniting and burning well, and you can see the electrode is in the flame, I would do a continuity test on the ignition wire and electrode. There can be a break in one or the other, and the spark will jump it, but it will not pass the current needed to sense the flame.
If the flame is not good, look at LP pressure, etc.
