Originally Posted by Sam
I have an Espar D7L heater on my Californian. The furnace will start and run for 10 minutes, working apparently well. Then the blade fuse which is at the furnace (30 amp was in it when we bought the boat, not sure if correct size) will blow. Any remedy or suggestions>
If you think the fuse is original and an exact replacement keeps blowing, you have a problem with the appliance. If you're not experience with this type of work, you should probably call in a pro.
If you don't think the fuse is original or don't know, you should find out from the manufacturer what value and type
of fuse should be installed. All 30 amp fuses, even blade fuses, are not the same. Some are designed to ignore brief surges in current, others are not.
If you've had the boat (or the furnace) for a while and it used to work fine but is now blowing fuses, there is most likely a problem with it and it should be serviced.