i had my old heater blow out on me a few times on windy days, but completely. but in your case, the pilot is still going..the pressure switch could need replacing..you could try pulling the wires on it (2 of them) and check for corrosion, see what shape the wires are in. i've had corroded ends on my pressure switch before. can you smell natural gas? if not, you're likely not getting flow in which case the thermocouple could be gone..it would be part of the control unit that has your gas switch for "on/off" on it and it's like a sensor wire really..not much to it or the principle. it's the first thing to go usually on natural gas water heaters so that's why i'm taking a guess at that. i wish i could tell you how easy it is to replace on a furnace..or not. i've only replaced them on water heaters.it's like a 14 dollar canadian part and half an hour labour if you're handy in that case. i'd suggest getting a copy of the manual and checking out the troubleshooting section. i'l sniff around too in the meantime.
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