I have the goodman gmpn-120-5, I have a solid red trouble lite, but my power exhaust fan will not come on everything else seems to working OK. Can you tell what the problem is with this furnace?

Power vent,, where might this vent be located? I ask because some folks seem to call the inducer assembly/motor a power vent . The inducer assembly is part of the furnace and if it isn`t working the furnace will not work. But what we should call a power vent which sometimes are mounted outside the furnace with the exhaust vented into powervent to help push the exhaust out of home,usually when there is farther distance than normal to blow out the exhaust,, lol,so with all this said,do you have a powervent or a inducer assembly(part of the furnace)

Yep, need to know exactly what part you are talking about. Can you post a few pics?

Start by checking for a call for heat from the stat if no call for heat venter will not start . If you have a call for heat check for power at venter . Power at venter could mean a bad venter or blockage in fan stopping it from running. No power at venter the relay that controls it is bad this item is on the board and will require a board replacement.