Miller Electric Comprehensive Miller Welder Troubleshooting Manual

5-3. Troubleshooting

	Trouble	Remedy
Wire does not feed, unit completely inop-		Turn Power switch On.
erative.
		Check circuit breaker CB1 (see Section 5-2).
		Check Interconnecting control cord connections (see Section 3-9).
		Check input power.
Wire does not feed.		Check circuit breaker CB1 (see Section 5-2).
		Check gun trigger connection at wire feeder. Check gun trigger leads and trigger switch. See gun Owner’s
		Manual.
		Check ground current sensor (see Section 3-9).
		Check welding circuit for shorts to case activating ground current sensor.
		Have Factory Authorized Service Agent check drive motor and control board PC1.
Wire feeds erratically.		Readjust hub tension and drive roll pressure (see Section 3-8).
		Use correct size drive roll (see Parts List).
		Clean or replace dirty or worn drive roll (see Section 3-7).
		Remove weld spatter around nozzle opening.
		Replace contact tip or liner. See gun Owner’s Manual.
		Have Factory Authorized Service Agent check drive motor and control board PC1.
Wire feeds when Jog switch is pressed		Check gun trigger connection at wire feeder. Check gun trigger leads and trigger switch. See gun Owner’s
but not when gun trigger is pressed.		Manual.
Wire feeds as soon as power is applied.		Check gun trigger. See gun Owner’s Manual.
Wire does not feed until trigger is		Check for short between gun trigger leads and weld cable. Repair or replace gun trigger leads.
pressed but continues to feed after
trigger is released.
Gas does not flow; wire feeds.		Check gas valve and flowmeter.

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