Question about Miller Welding Equipment

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Automactic idle control

Will not allways rev up when i strike an arc or use a electric tool used to just not work first couple time at start of work day but now may not work the whole day . getting cold outside high temp yesterday 15 or 20 degreees , did not work at all . turn key switch from auto to high will rev up. put in 50 degree shop this morning to try to figure out would not work but after hour or so in there started working. can you help?

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Hi there,
This sounds like your idle control module has gone bad. Since the machine will rev up to weld speed if you turn the switch to high it can't be that the solenoid has gone bad. Some models of engine driven welders from Miller use a little module, others have the idle circuit built into the control board, can't tell which yours is without a model number. This problem could also indicate a broken current transformer since letting the unit heat up makes things better. I'd use an ohm meter to check the resistance of the CT while it was cold to see if it goes from open circuit to just a few Kohms of resistance when it gets "room temp".

Rank me if this helps,
Carl

Posted on Dec 02, 2008

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