I have a 6220 pellet furnace and suddenly it keeps shutting down with an error code 2. Strangely the fire seems to be going strong when it does this. Pellets are feeding fine, vacuum seems fine and the fire is hot. Stove feels like its up to operating temp to me but the room fan only comes on in short bursts a few times, then it shuts down and I get error code 2. My gut feeling is a thermostat is bad and not telling it that its reached operating temp but thats just a guess. Error 2 also list "electrical open in low temperature switch or wiring". What exactly does this mean? Where is the low temperature switch?