Goodman Gpnu series, flame roll out
two family 3 story row house, 1 on the first 2 on the second and third.
1st 54k goodman 90% exhaust tube only
2nd 100K goodman 90% exhaust tube only
Help me out, I just at a loss. This is and intermittent problem I have found due to having to replace a flame sensor and stack sensor. Things I have checked, inducer working properly, vapor trap drain cleaned, corrected angle of the exhaust tube and checked for proper draining, no dips, no constrictions. All the furnace systems seem to be working properly now although the installation is a issue very poor and poorly mantained, None performed no air filters installed although the burner assembly is relatively clean with signs the role out has been going on for a while. With it being intermitant the system restarts itself and most of the time runs normal. During the installation the installer left both air returns open to the basement. Obviously this needs to be corrected imediately. Even with the doors open to the upstairs could this cause enough vacum when the larger furnace is running. Also this is and old frame house with no fire stops and a lot of open space, could the chiminey effect be part of thise. It does seem like the house is sucking air into the basement.
One more, should I try cycling it a number of times with the exhaust off the outside vent at the furnace to see if it stops. Yes I know not for long carbon monoxide.