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aire-flo gas furnace not reaching target temp, i have flash code
hello - i'm having problems with an older aire-flo gas furnace.
i set the thermostat to 67 in the morning and it will kick on at the right time (timer thermostat) but won't heat all the way to 67. it will heat to about 62 or 65 and shut off.
it seems to do this throughout the day, getting close to the target temp but rarely reaching it. the temp will usually fall to around 60, then it will turn on again for a little while, repeating the cycle.
a heating/cooling tech told me about the flashing light codes. mine indicates 6 + 4: lockout*, last event open limit or roll-out switching during run.
he said it had something to do with obstructed airflow. i've changed the filter (which was filthy) and opened all the vents but i'm still having the same problem.
luckily it never seems to get below 60.
any suggestions would be very helpful,