Not sure about that machine but if on the PCB there may be a heat sink with a 3 leg device, it may be a TIP 33c or something like that which would be driver for motor, they can go short circuit between 2 legs and give motor full speed
Check that and if you can post pic of PCB
Also check all connections to PCB and all soldered joints, look for cracked or dry joints
Hi, just bought a second hand Eland mig 160 (old one). Does anyone have, or know where I can get a wiring diagram for it as there are three wires disconnected inside that need connecting. The welder powers up but the torch trigger does nothing, suspec it has something to do with the three wires !!!! Thanks in advance for any help