My furnace does everything right . . . except when the thermostat is satisfied and the gas cuts off, the fan is supposed to continue for 90 seconds. It keeps on running and running. I have asked RV repairmen what it might be and they said in all probability the board. I can get to the limit switch and the air-flow switch, but not to the board. I am going to have to take the unit out, or at least the blower and motor to get to the board. I'm not sure how to do that. I have not explored all possibilities but thought if someone else had gone through removing the furnace, they might have some suggestions. I read the thread you mentioned. Thanks for the thought. Oh yes, the vent is covered and, while I have the cover off, I taped over the vents to keep out dirt dobbers and wasps.
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