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PTAC heating element blows fuse, why?

chuck_pietro

Aug 8, 2017
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Aug 8, 2017
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Hi,
I have a GE Zoneline PTAC HVAC unit Model AZ61H09DACW1. I was told unit did not produce the normal amount of heat. I found a fuse blown on one of three heating elements. I replaced the heating element and the fuse and it works fine now. My question is: I measured the resistance of the new heating elements and they are all within nominal range 100-200 ohms (depending on the element). The defective element had a resistance of 4700 ohms and I understand that these types of elements will increase their resistance over time due to corrosion or cracking. But why would it blow the fuse? I was taught a higher resistance would draw less current, not more.

Before replacing the element, I tried replacing just the fuse and, BAM, the fuse blew again. What am I missing?
Thanks.
 

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