Miller Electric and DS-74DX16 Troubleshooting, Disconnect power before troubleshooting, Remedy

8-2. Troubleshooting

		! Disconnect power before troubleshooting.
	Trouble	Remedy
Wire feeds, shielding gas flows, but elec-		Check interconnecting cord connections. If secure, check cord for continuity and repair or replace (see
trode wire is not energized.		Sections 4-5and 4-6).
Wire feeder is on, meter(s) do not light		Check and reset circuit breaker at welding power source.
up, motor does not run, gas valve and
welding power source contactor do not
pull in.
Electrode wire feeding stops or feeds er-		Check gun trigger connection. See gun Owner’s Manual.
ratically during welding.
		Check gun trigger. See gun Owner’s Manual.
		Readjust hub tension and drive roll pressure (see Section 4-11).
		Change to correct size drive roll (see Table 10-1).
		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 does not feed until trigger is pulled,		Check for a short between welding gun trigger leads and weld cable. Repair short or replace welding gun.
but continues to feed after trigger is re-
leased, and trigger hold is not on.
Gas valve in feeder is rattling loudly		Check for a short between welding gun trigger leads and weld cable. Repair short or replace welding gun.
along with possible erratic or slow wire
feed speed.
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.

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