Troubleshooting - Miller Millermatic 252 Owner's Manual

7-5. Troubleshooting

Trouble
No weld output; wire does not feed.
No Weld Output; wire feeds.
Low weld output.
Fan motor does not run.
Low, high, or erratic wire speed.
.
A complete Parts List is available at www.MillerWelds.com
Remedy
Be sure line disconnect switch is On (see Section 5-13).
Replace building line fuse or reset circuit breaker if open (see Section 5-13).
Secure gun trigger connections (see welding gun Owner's Manual).
HL.P 001 appears on meters. Turn power switch off and back on, if HL.P 001 appears on meters again,
have Factory Authorized Service Agent check unit.
HL.P 002 appears on meters. Thermistor RT1 is detecting an overheating condition. Wait for unit to cool
allowing the fan to run. After unit is cool, if HL.P 002 message remains, have Factory Authorized Service
Agent check for an open Thermistor RT1 (see Section 7-2).
HL.P 004 appears on meters. Reset message by releasing the trigger or removing stuck wire causing
short circuit (see Section 6-2) . If message remains, have Factory Authorized Service Agent check for
shorted trigger leads.
Have Factory Authorized Service Agent check Power switch.
Have Factory Authorized Service Agent check all board connections and main control board.
Connect work clamp to get good metal to metal contact.
Replace contact tip (see welding gun Owner's Manual.
HL.P 003 appears on meters, have Factory Authorized Service Agent check main control board and main
rectifier.
Connect unit to proper input voltage or check for low line voltage (see Section 5-13).
Check input voltage jumper links and correct position if necessary (see Section 5-11).
Have Factory Authorized Service Agent check main control board.
Have Factory Authorized Service Agent check fan-on-demand circuit.
Readjust front panel settings (see Section 6-1).
Change to correct size drive rolls (see Section 7-3).
Readjust drive roll pressure (see Section 5-14).
Replace inlet guide, contact tip, and/or liner if necessary (see welding gun Owner's Manual).
Check position of input jumper links (see Section 5-11).
Have Factory Authorized Service Agent check main control board.
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