I checked the pump (Mag 12) and it seems to be ok, granted I don't have a flow meter to check the flow. I checked the hoses and they are clear. I did have a guard on the pump in case any fish/hermits went through but I no longer have hermit crabs and the fish would get caught in the sock anyways so I removed the guard which will increase the flow a bit. I'm not really sure how old the pump was, I bought it used a number of years ago with a DIY skimmer. I would say its probably at least 4 years old.
I checked everything for algae/calcium build up, emptied out the chiller and got nothing.
As for the fuses, they're the "same" ones that came with the chiller, granted they aren't from PCI. I haven't changed anything about the chiller and how it runs except its location.
I just don't understand how the chiller can run for a week and then whammo. Fuse blows. I think it knows the place that sells fuses is closed on weekends
Anyway, the chiller was still running when I left, we'll see if its still chugging along when I get home on friday.