Miller XR - Pistol - Pro, Owner'S Manual, Page: 25 / 40

OM-254 824 Page 21
7-6. Troubleshooting
!
Disconnect power before troubleshooting.
Trouble Remedy
Pressing gun trigger does not energize
feeder. Welding wire is not energized.
Shielding gas does not flow.
Secure plug from gun control cable into Gun Control receptacle on feeder
(see Section 5-2 or 5-3 as applicable).
Have nearest Factory Authorized Service Agent check optional water flow switch, if applicable.
Wire feeds, shielding gas flows, but
welding wire is not energized. See Troubleshooting section in welding power source manual.
Wire feeds erratically.
Adjust drive roll pressure if necessary (see Section 5-6).
Clean or replace drive rolls as necessary (see Section 7-3).
Check and replace liner if necessary (see Section 7-4).
No weld output; gun/feeder does not
work. Check gun trigger plug connection on wire feeder front panel (see Sections 5-2 and 5-3).
Place Power switch on welding power source in the On position.
Erratic weld output. Tighten and clean all connections.
Check drive roll pressure in wire feeder and gun (see Section 5-6).
Check and replace liner if necessary (see Section 7-4).
Wire does not feed; burnback in contact
tip. Check drive roll pressure in wire feeder and gun (see Section 5-6).
Check and replace liner if necessary (see Section 7-4).
Reinstall voltage sensing lead (see Section 5-1).
Gun overheating (water-cooled
models).
Be sure coolant flow rate is at least 1 qt/min.
Corrosion buildup in gun decreasing coolant flow rate. Backflush coolant system, clean coolant system
filter, and clean fittings.