My Trane furnace is not putting out heat. Thermostat works, fan blows but burners are not lighting. Getting 3-flash error code, which, according to the manual is a Draft Pressure Error - possible problems, venting, pressure switch or inducer.
I've turned off power, turned on. I've turned off gas, turned back on. Vents are clear - is there anything I can do to reset this and get it to light the burners again?