Had the same problem with mine but mine isn't miller and don't know if your's is built the same but if you access the inside of the machine there's there's a large copper spool inside and that wire feed handle is powered through it. The connection heats up over time and becomes a short. I re spliced mine then soldered it and then cut piece of copper tubing and crimped it around the connection and soldered that as well. Corrected the problem and I tried pretty much all listed solutions other then this first. Tried the new liner in the torch, the new tip and clamping the wire feed assembly with a clamp instead of the tensioner. All failed. I stumbled on to the fix accidentally when I was trying to install a more heavy duty fan. Hope this helps. Good luck.
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Had the same problem with mine but mine isn't miller and don't know if your's is built the same but if you access the inside of the machine there's there's a large copper spool inside and that wire feed handle is powered through it. The connection heats up over time and becomes a short. I re spliced mine then soldered it and then cut piece of copper tubing and crimped it around the connection and soldered that as well.
Corrected the problem and I tried pretty much all listed solutions other then this first. Tried the new liner in the torch, the new tip and clamping the wire feed assembly with a clamp instead of the tensioner. All failed. I stumbled on to the fix accidentally when I was trying to install a more heavy duty fan. Hope this helps. Good luck.