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Have you looked at your fan motor? Maybe it's dead?
Without actual numbers there is no way to determine what is causing the fuse to blow. You have measure voltage drops across various parts of the system to find out where the load is coming from. Being that this system has worked in the past and is now causing problems I would believe that the problem lies in either the wiring or even the fan motor. It could be either a short to ground, or it could be a bad motor drawing excessive amperage.
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