Yesterday woke up to a cooler than normal house. Come downstairs and the thermostat is calling for heat (68 F), furnace is running but when I checked one of the vents it's blowing cold. Pull the combustion chamber cover, no flame. Turned down the thermostat to below room temp and the fan keeps running. In the end I pulled the lower cover, the door switch of course kills everything. I pushed the switch in to run the control board's diagnostic, it tells me the last code was "flame rollout switch open". Interestingly the fan does not come back on when I push in the cover switch. So I decided to put everything back together while I hit the intrawebs to research the issue, cranked the thermostat back up and lo and behold the furnace starts working normally (inducer start, burner lights and I have warm air out of the vents). Great. Except 25 minutes later I hear a click from the furnace and sure enough- flame out. Fan keeps running. By now I had read that flame rollout switches have a reset button. So pulled the cover again, my York furnace had 3 rollout switches. Pushed each one, no clicks heard or felt, tested each one for continuity with my multimeter and then started it up again. Well, it is now 36 hours and the furnace is running fine. I talked to an HVAC guy today, he said they get a lot of calls for the same thing when it gets windy (we had a front move in last night). So FYI, if your furnace was working fine but suddenly is just blowing cold air continuously check your flame rollout switches.

[img]https://cimg4.ibsrv.net/gimg/www.doityourselft.com-vbulletin/1080x1440/ac1_fb1d0be821e566a1bd8b558f15b12442bb3bd176.jpeg[/img] [i]I need to remove the intake and run in outside to the soffit any suggestions?[/i]