Troubleshooting - Miller 3045 FC Owner's Manual

6-5. Troubleshooting

Trouble
Wire does not feed; open-circuit voltage
available.
Wire does not feed; no voltage at gun tip. Verify input power cord is connected to a 115 V AC power source (see Section 4-7).
Wire feeding stops or does not feed
properly during welding.
Wire speed oscillates at start of weld in
constant current (CC) applications.
Wire stubbing on low end in constant
current (CC) applications.
Wire feeds erratically.
Wire feeds as soon as power is applied. Check gun trigger switch, and replace if necessary (see Section 6-4).
Gas does not flow or does not stop flow-
ing; wire feeds (units with optional gas
solenoid only).
Wire remains energized after trigger is
released.
Check fuse F1, and replace if open (see Section 6-2).
Unit overheated. Turn Power switch Off and allow unit to cool.
Check sensing lead connection.
Check gun trigger plug connection.
Check contact tip. Check for kinks in gun cable.
Check gun trigger switch, and replace if necessary (see Section 6-4).
Verify welding equipment is installed and connected correctly (see Section 4-7).
Verify input power cord is connected to a 115 V AC power source (see Section 4-7).
Turn Power Control switch On (see Section 5-1).
Verify welding equipment is installed and connected correctly (see Section 4-7).
Check fuse F1, and replace if open (see Section 6-2).
Straighten gun cable and/or replace damaged parts (see Section 6-4).
Check for correct size drive roll, liner, and tip (oversized tips may be needed for some wires).
Adjust drive roll pressure (see Section 4-6).
Readjust hub tension (see Section 4-5).
Clean or replace liner if dirty or plugged (see Section 6-3). Check for burrs when wire is cut to length.
Replace drive roll or pressure bearing if worn or slipping.
Check position of CC/CV switch (see Section 5-1).
Increase output setting of welding power source.
Readjust hub tension.
Readjust drive roll pressure (see Section 4-6).
Check position of CC/CV switch (see Section 5-1).
Clean or replace dirty or worn drive roll (see Section 4-2).
Remove weld spatter around nozzle opening.
Replace contact tip or liner (see Section 6-3).
Check gas valve.
Have Factory Authorized Service Agent check control board PC1.
Check contactor CR5 to see if contacts are frozen closed.
Remedy
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