My miller 250 gas drive welder shuts off after 5 minutes of running

check for fuel flow blockage
check for blocked main jet

The Miller 212 has a 60% duty cycle. So for every ten minutes of welding the machine is designed to weld for 6 min and cool down for 4 min.

If your Miller Bobcat 250 runs great, the generator works, but the welder will not weld, even though the fuses are good, it could be caused by a few different things. Here are a few things you can try to fix the issue:

1. Check the welding settings, make sure they are appropriate for the type of welding you are doing. Make sure the voltage and amperage are set correctly.
2. Check the ground connection, make sure it's clean and tight. The ground connection must be secure for stable welding.
3. Inspect the welding cables and make sure they are in good condition and that the connections are tight.
4. Check the welding gun and make sure it's clean and in good condition.
5. Check the main contactor and make sure it's engaging and disconnecting properly.
6. Check the main circuit breaker and make sure it's not tripped.
7. Check the power output of the generator and make sure it's within the correct range.
8. Check the control circuit and make sure that it's not damaged or malfunctioning.

It's important to check the manual of the welder for troubleshoot steps and also check the warranty of the welder and see if it's still covered by the manufacturer. If you are not able to find the problem or if you are not familiar with welding equipment, it's best to take your welder to a qualified Miller Electric welder repair service center, they will be able to diagnose and fix the issue.

My welder will only run above full at full line it dies why

Hi:
The most common problem is the oil pressure switch. First make sure your machine has the oil up to the level line. If oil level is ok, then order the oil pressure switch and change it. If neither of these two actions cure the problem then send it in to be inspected by an authorized service mechanic.

Good luck

Hi:

The normal set up on the 250 syncrowave will allow you to control your pre and post flow of gas. If the post flow is set up to more than 2 seconds that's the problem. If it is set on zero, then you have a leaky solenoid valve. Check your owners manual for troubleshooting anf repair.

Hi:
Probably your solenoid gas valve is obstructed by dirt. You can take it out and blow it with air or just replace it with a new one.

Check the oil safety switch maybe it is bad. It will stop running if low on Oil or wont start.

I have a Miller XMT304 in for repair at the moment and it will run full load (250A) on a load bank for 5 minutes before the fan comes on. By the way the fan is 24v DC. I couldn't be sure but your fan may be similar
Hope this helps.

Your problem is in one of two areas. The controller board inside the unit or a bad trigger on your gun.

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