OM-281426 Page 48
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Complete Parts List is available at www.MillerWelds.com
Message Error Remedy
The secondary circuit thermistor is reading too
high or too low for a valid temperature.
The control board is damaged.
Thermal error-Magnetic thermistor
range error.
The magnetic circuit thermistor is unplugged. Contact Miller Electric Mfg. LLC service
department
The magnetic circuit thermistor is reading too
high or too low for a valid temperature.
The primary control board is damaged.
Boost error-Cycle power to clear error. The primary boost has not successfully been
established.
Cycle power to clear error. If this error persists
after a power cycle, contact Miller Electric Mfg.
LLC service department.
Over voltage-Cycle power to clear. Primary voltage is above 310 volts. Reduce primary voltage below 310 volts.
Under voltage-Cycle power to clear. The primary voltage is below 90 volts. Increase primary voltage above 90 volts.
Network error-Communication be-
tween micros has been lost.
The two microcontrollers on the control board
are no longer communicating.
Cycle power to clear error. If this error persists
after a power cycle, contact Miller Electric Mfg.
LLC service department.
Network error-Communication be-
tween boards has been lost.
The wiring harness between the control board
and interface board is damaged.
Cycle power to clear error. If this error persists
after a power cycle, contact Miller Electric Mfg.
LLC service department.
The primary control board is damaged.
The interface board is damaged.
Secondary Current FB error-Check
Weld Current FB device.
The wiring harness between the control board
and weld current sensor is damaged.
Cycle power to clear error. If this error persists
after a power cycle, contact Miller Electric Mfg.
LLC service department.
The weld current sensor is damaged.
Weld over voltage error - Cycle power
to clear error.
The secondary control board is damaged. Cycle power to clear error. If this error persists
after a power cycle, contact Miller Electric Mfg.
LLC service department.
Clamp error - Cycle power to clear
error.
The secondary control board is damaged. Cycle power to clear error. If this error persists
after a power cycle, contact Miller Electric Mfg.
LLC service department.
7-5. Troubleshooting
Trouble Remedy
No weld output; unit completely
inoperative.
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.
No weld output; unit is on. Check and secure loose weld cable(s) into receptacle(s).
Check and correct poor connection of work clamp to workpiece.
Erratic or improper welding arc or
output.
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.
Fan not operating. 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.
Stick welding problems: Hard starts;
poor welding characteristics; unusual
spattering.
Use proper type and size of electrode.
Verify electrode polarity; check and correct poor connections.
Make sure a remote control is not connected.
TIG welding problems: Wandering arc;
hard starts; poor welding characteris-
tics; spattering problems.
Use proper type and size of tungsten.
Use properly prepared tungsten.
Verify electrode polarity.
TIG welding problems: Tungsten elec-
trode oxidizing and not remaining
bright after welding.
Shield weld zone from drafts.
Check for correct type shielding gas.
Check and tighten gas fittings.
Verify electrode polarity.
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