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Thermal error-Magnetic thermistor
range error.
Boost error-Cycle power to clear error.
Over voltage-Cycle power to clear.
Under voltage-Cycle power to clear.
Network error-Communication be-
tween micros has been lost.
Network error-Communication be-
tween boards has been lost.
Secondary Current FB error-Check
Weld Current FB device.
Weld over voltage error - Cycle power
to clear error.
Clamp error - Cycle power to clear
error.
7-5.
Troubleshooting
Trouble
No weld output; unit completely
inoperative.
No weld output; unit is on.
Erratic or improper welding arc or
output.
Fan not operating.
Stick welding problems: Hard starts;
poor welding characteristics; unusual
spattering.
TIG welding problems: Wandering arc;
hard starts; poor welding characteris-
tics; spattering problems.
TIG welding problems: Tungsten elec-
trode oxidizing and not remaining
bright after welding.
OM-281426 Page 48
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Error
The secondary circuit thermistor is reading too
high or too low for a valid temperature.
The control board is damaged.
The magnetic circuit thermistor is unplugged.
The magnetic circuit thermistor is reading too
high or too low for a valid temperature.
The primary control board is damaged.
The primary boost has not successfully been
established.
Primary voltage is above 310 volts.
The primary voltage is below 90 volts.
The two microcontrollers on the control board
are no longer communicating.
The wiring harness between the control board
and interface board is damaged.
The primary control board is damaged.
The interface board is damaged.
The wiring harness between the control board
and weld current sensor is damaged.
The weld current sensor is damaged.
The secondary control board is damaged.
The secondary control board is damaged.
Place line disconnect switch in On position.
Check and replace line fuse(s), if necessary, or reset supplementary protector.
Be sure power cord is plugged in and that receptacle is receiving input power.
Check and secure loose weld cable(s) into receptacle(s).
Check and correct poor connection of work clamp to workpiece.
Use proper size and type of weld cable (see your Distributor).
Clean and tighten weld connections.
Verify electrode polarity; check and correct poor connections to workpiece.
Unit not warmed up enough to require fan cooling.
Check for and remove anything blocking fan movement.
Have Factory Authorized Service Agent check fan motor and control circuitry.
Use proper type and size of electrode.
Verify electrode polarity; check and correct poor connections.
Make sure a remote control is not connected.
Use proper type and size of tungsten.
Use properly prepared tungsten.
Verify electrode polarity.
Shield weld zone from drafts.
Check for correct type shielding gas.
Check and tighten gas fittings.
Verify electrode polarity.
Remedy
Contact Miller Electric Mfg. LLC service
department
Cycle power to clear error. If this error persists
after a power cycle, contact Miller Electric Mfg.
LLC service department.
Reduce primary voltage below 310 volts.
Increase primary voltage above 90 volts.
Cycle power to clear error. If this error persists
after a power cycle, contact Miller Electric Mfg.
LLC service department.
Cycle power to clear error. If this error persists
after a power cycle, contact Miller Electric Mfg.
LLC service department.
Cycle power to clear error. If this error persists
after a power cycle, contact Miller Electric Mfg.
LLC service department.
Cycle power to clear error. If this error persists
after a power cycle, contact Miller Electric Mfg.
LLC service department.
Cycle power to clear error. If this error persists
after a power cycle, contact Miller Electric Mfg.
LLC service department.
Remedy
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Table of Contents
Troubleshooting
