My Atwood 8500 furnace will not light
Was just trying out furnace on new to me 2009 airstream and furnace will not fire. It did work a couple times but today would not at all. It would start and stop fan really fast about 3 time and on fourth try fan would keep running longer but no igntion or ignition noise then shut off and light would flash on circuit board one flash every three second. The manual says light means there is limit switch/airflow problem. Where is air sucked in for furnace is it under fridge and sucked in from top of heater box. If it is there there is a crazy amount of dog hair under there from previous owner dog I take and how would I clean out intake. Thanks for any help.