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Old August 7th, 2013, 04:14 PM   #1
sluginxlt
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Default miller 180 gas problem

I have a millermatic 180 mig welder that i bought new 6 years ago. It has been a great machine until now, the sheilding gas is always flowing when the welder is on. as soon as i turn on the welder you hear the click of the gas solenoid that you usually hear when you pull the trigger. If anybody knows anything about them please help me figure it out.
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Old August 7th, 2013, 04:20 PM   #2
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does it stop when you diconnect small plug from whip on front of welder? i suspect bad switch or pinched wire
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Old August 7th, 2013, 05:49 PM   #3
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no i didnt try that but that is a great idea! i read that it could be trigger, solenoid, or circut board but wasnt sure how to determine but your advice will answer if its in the gun or not.
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Old August 7th, 2013, 09:26 PM   #4
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well i went out to the garage and unplugged the wire from the gun to the machine and the gas flow still come on when i turn on the welder. I decided to remove the cover to see whats inside. theres 2 wires running to the gas valve i unplugged the white wire "not knowing what im doing" and then turned the machine on and the gas has stopped so i guess that means the valve is not physically stuck. so now could it be the valve solenoid or is it the board?
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Old August 7th, 2013, 09:36 PM   #5
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Originally Posted by sluginxlt View Post
well i went out to the garage and unplugged the wire from the gun to the machine and the gas flow still come on when i turn on the welder. I decided to remove the cover to see whats inside. theres 2 wires running to the gas valve i unplugged the white wire "not knowing what im doing" and then turned the machine on and the gas has stopped so i guess that means the valve is not physically stuck. so now could it be the valve solenoid or is it the board?
Solenoid is good, otherwise it would never stop. There has to be a relay that fires the gas valve that is stuck closed, so when you flip the power switch on it charges the solenoid. May be a cube relay, or it could be built into the board. Tap gently on all the little black boxes on the circuit board and one of then may release and stop the gas.

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Old August 9th, 2013, 06:30 PM   #6
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if you lived closer I could take a look at it, I beleive the problem will be circuit board
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Old August 9th, 2013, 07:55 PM   #7
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Our miller 180 did the same exact thing I can't remember at the moment what it was but I remember it being something dumb and easy.
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Old August 15th, 2013, 05:57 PM   #8
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Our miller 180 did the same exact thing I can't remember at the moment what it was but I remember it being something dumb and easy.
well i hope you think hard and remember lol. i use it quite often for my projects and dont want to run out another bottle of gas on it while its broke.
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Old August 21st, 2013, 07:14 PM   #9
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If I remember correctly it was in the trigger.

It was what ever clicks the gas on was sticking open
I'm sorry I'm don't know the names of the parts but that's what it was
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