Miller Electric SS-75S12 Troubleshooting, Disconnect power before troubleshooting, Trouble Remedy

6-4. Troubleshooting

	Y Disconnect power before troubleshooting
Trouble	Remedy
Wire feeds, shielding gas flows, but	Check interconnecting cord connections. If secure, check cord for continuity and repair or replace
electrode wire is not energized.	(see Sections 4-5and 4-6).
Wire feeder is on, display does not	Check and reset circuit breaker at welding power source.
light up, motor does not run, gas valve
and welding power source contactor do
not pull in.
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 4-15).
	Change to correct size drive roll (see 4-11).
	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, unit jogs and purges but will not
trigger.
When triggered wire feeds but no gas,	If the welding arc does not establish in 3 seconds after the gun trigger is activated the unit will feed
no contactor.	wire, but turns off contactor and gas valve. If the gun trigger is still activated after two minutes, the
	wire will stop feeding.

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