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BJ Weeks
BJ Weeks Posted on Jan 16, 2020
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Millermatic 251 welder. I need to troubleshoot it.

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Attique-ur-Rehman

Attique-ur-Rehman

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  • Master 2,677 Answers
  • Posted on Jan 28, 2020
Attique-ur-Rehman
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2 Related Answers

witmoz

Robert Monigold

  • 390 Answers
  • Posted on Sep 02, 2010

SOURCE: I have a miller 251 millermatic welder that has no

check the wireing from the gun to the servo,it may have got damaged.then test the servo

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Anonymous

  • 3 Answers
  • Posted on Aug 15, 2011

SOURCE: I have a millermatic 251

First, you need to check that you have the correct input voltage going to the machine. The main PC board on the welder disperses the input voltage to many different things,ie. the gas solenoid, the drive motors, contactors, transformer, stabilizer etc.

So if your machine is made to run on 230v and it is plugged into 208v, the first thing to stop working is the gas solenoid because it requires more voltage (34vdc on this model) to actuate.
If it turns out you are running the correct power to the machine, there is something wrong with an internal component on the machine and it needs to be brought to a certified miller service center where it will most likely be one of two things, the gas solenoid (about $30+ labor) or the main PC board ($500-600+labor) hope for the best on that one.
best of luck!

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Millermatic 135 wire speed control , runs on high all the time. Everything else works fine. How to troubleshoot the problem?

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