2015 Thor Hurricane

[Mike2422]

I got a 2015 Thor Hurricane and furnace keeps blowing 15amp fuse. Fuse blows as soon as i try to turn furnace on. Took covers of furnace no visible shorts in wires when I unplug furnace from rv connection and try to turn it on its doesn't blow fuse any ideas what's wrong bad board in furnace or what can I check next. Thanks in advance

[Mike2422]

Will do thanks

[bullydogs1]

isolate problem to furnace itself...find 12 v wire going in and make sure it gets 12v from thermostat...Almost bet it could be fan motor itself..or a grounding connection on the furnace...

[Mike2422]

I have done that seems to spin freely any other ideas.

[wolfe10]

Try to spin the fan by hand (yes, with furnace OFF).

Could be that a mud dubber nest is keeping the fan from spinning properly, causing high amp draw.