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VR1 on the control board is how you adjust the amp limit. I am not sure which way lowers it I think counterclockwise. Mine has always been at the lowest limit and I have never hit that.
You would think that there is enough headroom on those MOSFET's .
It must be something else. When I soldered mine on I heated the gun till it was red then soldered for only a second or two.
Mine has been in service for 4 years now without any trouble other than the cheap potetiometers that I use.
Alvin
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