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first unscrew the tiny tip at very end of torch (can be hot)!! then try to feed wire thru handle,gently shake cable as you do helps to feed wire thru cable , if successful you have allowed the amps to get too high for the feed rate (slow) and melted the tip closed , these tips are replaceable from miller and are not expensive
The contact box inside your welder need to be replaced. This problem will create burn backs and probably an accident since the gun it's hot always.
The part number you need to replace is MIL189486. If you don't have a sales rep from a welding store, here's the link to praxair, they will ship direct to your address via USP. Contact them by the 800 number or find your nearest location.
It could be just the simple problem of the trigger not working. Disconnect the trigger wires from the machine at the plug at the front of the machine. See if you can manually trigger the machine by placing a piece of bent over mig wire onto the contacts. If the machine does trigger from this then your fault is in the torch somewhere. It could be the trigger (which commonly does fault from a dusty environment) which is easily replaced by going into any welding store with the torch model number (magnum 250L), or it could possibly be that a trigger wire has broken from the torch being damaged
1] Switch off the mains power,remove the torch from the machine,ther should be a button or switch on the unit to feed the wire, push or switch these and observe that the wire feeds and dose not heat up, if ok then you have a short in the torch, a new torch assembly is required,if the wire heats up with the torch removed, the wire spool is shorting out, remove the spool and check wiring in and around the feed motor, if you can't see anything check for a voltage from a good earth and on the rollers, if you have a voltage then the motor is faulty.(earthing out) a P.A.T test should show exactly where this is.
This fault is typical in most MIG/MAG Units. the feed roller/s need slackening off, pull the trigger so the rollers spin wire the wire not moving, turn the tensioning 1 turn check to see if the wire feeds, if not give a half turn on the tentioner repeat this half turn untill the wire feeds, bend the wire to the torch and pull the trigger, If the wire feeds then thats the correct setting. be awear of all safety rules. use gloves