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Combustion blower turns on and never stops running

\015 I have a Lennex furnace 80MGF. The combustion chamber blower stays running. I have checked the outlet to make sure that it was not plugged all ok. It will not allow the furnace to start becauce this is always running. I dont know what else it could be. I have checked the wiring and i have checked the wire connections. I can get the furnace to run one cycle by tricking the pressure switch. Please help.\015

Answers :

Sounds to me like the furnace isn't getting enough fresh air for combustion and the pressure switch isn't closing. try taking the cover off the burner assembly and c if that works

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