My York Diamond 80 is not heating. When I turn it on the fan starts but flame does not attempt to ignite. The diagnostic code flashes 4 times. Sheet says 'Aux. Or Spill Limit switch' What are these? Where are they? Can they be reset?

I have an error code that says the aux spill swich is open, But I think it is just going bad because it works sometimes and may be getting ready to go bad. Where to find an aux spill switch for york diamond 80 furnace?

I have a concord 80% efficiency furnace. The fan comes on occasionally but will not stay on for more than a minute. The diagnostic light is flashing a series of 3 lights which indicates a pressure switch or auxiliary limit is stuck open -- how do I find these switches and 'close' them?

Hi, I've got a goodman furnace (mod. # GHT070-3) it's about 5 years old. Recently, the heat will only kick on for about 30 seconds then shut off. It's giving me 4 flashes: Open limit switch, then it kicks off. After that it gives me 3 flashes and turns back on (pressure switch). It seems the...

Hello Folks, This weekend I've been playing with a heating system at my new apartment and I'm trying to figure out what the different componets do. I kind of followed the circuit but still have some missing links... 1-There are some terminals on the furnace's circuit board labeled LIMIT. The...