Norcold 1200 series fridge blowing 5 amp AC fuse

I checked both heating elements and neither one show a short. After researching a bit, I kept reading about the Thermistor. I decided to check the ohms on it and there is no reading at all, it's just open. It's currently 60 degrees at my house so from what I've read I should be getting a reading somewhere between 12.1 and 13. So obviously my Thermistor is bad, but could that be what's causing my AC fuse to blow? I could see it blowing a fuse with a closed circuit, but not an open circuit. Any ideas?

If it didn't blow the fuse after you removed the element from the circuit, it's the element that's bad.

Thanks for the replies. I did try unplugging the heating elements but when I did I received an error code. I don't recall exactly what the error code was, but it was something that made sense that there was a problem with the heating element (they were unplugged). It didn't blow the fuse, but I was thinking that because of the error the unit didn't try to turn on. After reading all of your replies, I'm going to check the elements to ground when I get home after work tonight. I'll let you know what I find.
Thanks again!

The Icemaker has a different 120 connection It is DIRECT and does not go thru the control board. The Fuse blows because one of the heating elements is grounded. Bad Element. Replace BOTH. Doug

you ohm checked the heating elements
but did you unplug them
and connect the ac power
good chance they 'leak' current from the element through the ceramic casing to grounded metal flue/chimney

Did you try ohms from each heat element lead to exterior shell of element. That would be short to ground causing fuse to blow.