Could be the ignitor also,sounds like it wants to start but isn't seeing flame.It could be that it's doing what it should and the fan is running to clear the lp from the unit to prevent explosion.I know you said you took unit out but you could have checked outside to see if you smell lp or even hear the ignitor trying to light assuming you so have electronic ignition(which most do now) My camping buddy had a issue where his 1 tank went empty and he swapped tanks and heat wouldn't work at all,i wasn't there but he bleed out line and heat still wouldn't work,he had to run his oven to purge out line and restart opening gas valve nice and slow,heater ran fine after that
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06 2500 Duramax. Air lift 5000 air bags,Equalizer WDH, EFI live,fass fuel system,4" straight pipe
2015 Jayco Eagle Premier 314BHDS
IBEW local 94 Electrical Worker
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