Miller Electric OM-220 390F manual Troubleshooting, Disconnect power before troubleshooting

8-3. Troubleshooting

	Y Disconnect power before troubleshooting
Trouble	Remedy
Wire feeds, shielding gas flows, but	Check and secure weld cable connections (see Section 5-2).
electrode wire is not energized.
Electrode wire feeding stops or feeds	Check gun trigger connection. See gun Owner’s Manual.
erratically during welding.	Check gun trigger. See gun Owner’s Manual.
	Readjust hub tension and drive roll pressure (see Section 5-6).
	Change to correct size drive roll (see 5-6).
	Clean or replace dirty or worn drive roll.
	Incorrect size or worn wire guides.
	Replace contact tip or liner. See gun Owner’s Manual.
	Remove weld spatter or foreign matter from around nozzle opening.
	Have Factory Authorized Service Agency check drive motor or motor control board PC1.
Motor runs slowly.	Check for correct input voltage.
Wire feeder power is on, displays light	Check welding gun trigger leads for continuity, and repair leads or replace gun.
up, but unit is inoperative.

OM-220 390 Page 30