hello my name is mel and i live in bc. i own a 1974
trillium trailer. when i recently tried to
light my duo therm 65211-2 wall
furnace, i held in the pilot
light and it stayed lit for approx. 10-12 seconds and then i get a back flash and the pilot and
furnace go out. the previous day i removed approx 6-8 wasp nests in the
furnace vent. the vent is riveted on so i cannot see if there are any more wasp nest. any help would be appreciated. thanks mel