Miller 252 Can't turn heat down

[Buckmaster1967]

Hey guys,
Was welding hard wire .35 wire and mixed gas with me Miller 252 Mig welder . Purchased it new couple years ago. Never had a second of trouble with it. Was welding 22ga steel at 15 heat and 88 speed. Been welding about 30 minutes and it started blowing the metal out. Like I had it setting on 24 heat for 1/2" metal. I checked the settings, changed the tip. Need a reset o the machine. Unplugged , plugged back on. Same results, Can't turn the heat now on the gun. No help in troubleshooting guild. Anyone seen this?

[cuttinparts]

That's very odd, never heard of that happening. Maybe its a variable resistor on the other side of the adjustment dial and has gone bad. Could open it up and have a look. If its a variable resistor type you could check with a multimeter if the resistance changes when you turn the dial.

[SegoMan DeSigns]

Try a system reset, my 350P gets out of whack on occasions and requires it:

Pg 30 of the book / page 34 of the pdf doc

https://www.millerwelds.com/files/owner ... 3R_MIL.pdf

[cuttinparts]

Great tip SegoMan, I had no idea!