Miller syncrowave 350lx -4 code when turning on.

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Hi, I acquired a syncrowave 350lx that I am having issues with. The issue is that I put a 240v plug on it to use in my garrage and when I power it on I get a code that says -4 in the voltage section of the digital readout and then it goes blank and does not show anything in either readout volts or amps even though the machine and cooler sound like they are running. When I wired the plug I put the green plug on top as the ground and the white and black cords as pos/neg. When I attempted to strike an arc I'm not getting a proper arc just a thin stream of electricity between the tungsten and workpiece. I'm worried that the machine may be underpowered or that I may have wired the plug wrong. I have not attempted to use it again pending a reply from miller electric or any other suggestions that may help. I have pictures of everything I mentioned but I don't see a section to upload. I'm hoping I can figure this out without having to take it into a repair facility
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You can click on the Photo icon to add photos.Ed Conleyhttp://www.screamingbroccoli.com/MM252MM211 (Sold)Passport Plus & Spool gunLincoln SP135 Plus- (Gone to a good home)Klutch 120v Plasma cutterSO 2020 benderBeer in the fridge
Reply:Go to miller website, mllerwelds.com and look for the manual, t will have trouble shooting section. Here is a random example.https://www.millerwelds.com/files/ow...O363AN_MIL.pdfMike
Reply:First unplug the welder and then open the small panel on the back of the welder.should be the connection terminals for the line cord and a row of bolts with and couple of brass jumpers. If you have a 208,230,460 welder and the single jumper is in the middle, you are set for 460 volts. the 230,460,575 is different. see labels in the welder or check the owners manual for correct jumper setting for your line voltage. 208 and 230 volts use two jumpers. 230 volts are side by side.for there to be an error code, the top display should read hlp and bottom will have a number. At power on it is normal for the display to show numbers in both displays then blank out and show a dash number. This is the software number that install on the pcb. after that the amp display should be on with the amp setting. voltage may be off until you turn the output on. then it will display open circuit volts or weld volts when arc is started. If you know how to use a test meter safely. measure the line voltage at the cord terminals. needs to match jumper setting. Get help if you don't have a meter or know how to use one. Proper voltage here will tell you if the plug and cord are wired correctly. You also with power off. Use the OHM setting and measure from the welder case to the line receptacle metal case. must be zero ohms. if OL your wired wrong. Be careful around the control pcb, they are pricey and can be difficult to replace. older machines require modification to accept the new pcb. have to move several wires around and Miller will not warranty the pcb if not installed by a Miller service shop.