Miller Electric OM-227 398D manual Troubleshooting Table, Disconnect power before troubleshooting

6-3. Troubleshooting Table

	! Disconnect power before troubleshooting.
Trouble	Remedy
No wire feed at gun, feeder not operat-	Reset circuit breaker in feeder/control box. See feeder/control owner’s manual.
ing. Check motor or brake solenoid.	Replace trigger-switch and test operation.
	Check trigger-switch wires for continuity.
No wire feed at gun, feeder operating	Reset circuit breaker in feeder/control box and check for short in motor leads. See feeder/control owner’s
properly.	manual.
	Check potentiometer with meter and replace if necessary.
	Check motor and potentiometer wires for continuity.
	See feeder/control owner’s manual.
Wire feeds, but welding wire is not ener-	Clean and tighten all power connections.
gized.	See feeder/control owner’s manual.
	Check operation of welding power source.
Wire feeds erratically.	Check conduit for wear and obstruction and replace if necessary.
	Check contact tip for correct size and replace if necessary.
	Check pressure roll tension setting (see Section 5-2).
	Check for proper head tube liner (see Table 9-7).
Wire feeds one speed only.	Check potentiometer with meter and replace if necessary.
	Check continuity of welding gun wire feed speed potentiometer and replace if necessary.
	See feeder/control owner’s manual.
Pressing gun trigger does not energize	Secure plug from gun control cable into gun control receptacle on feeder.
feeder. Welding wire is not energized.	Have nearest Factory Authorized Service Agent check optional water flow switch, if applicable.
Shielding gas does not flow.
Wire feeds, shielding gas flows, but	See Troubleshooting section in welding power source manual.
welding wire is not energized.
Arc varies and welding wire is kinked	Place Motor Torque switch in low torque position if welding with .030 (0.8 mm) aluminum welding wire on
when feeding out gun.	an XR control box.

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