Miller Millermatic 255, Owner'S Manual

Page: 51 / 68

A complete Parts List is available at www.MillerWelds.com
OM-279299 Page 47
Message Remedy Error
Thermal Error
Secondary magnetics thermistor open
Ambient temperature is too cold for valid reading. Place unit in environment warmer than –30
°
F
(–22 ° C).
The secondary magnetics thermistor is un-
plugged.
Contact authorized Miller service center.
The secondary magnetics thermistor is reading
too low for a valid temperature.
The control board is damaged.
Thermal Error
Output rectifier thermistor shorted
The output rectifier thermistor is reading too high
for a valid temperature.
Contact authorized Miller service center.
The control board is damaged.
Thermal Error
Output rectifier thermistor open
Ambient temperature is too cold for valid reading. Place unit in environment warmer than –30 ° F
(–22 ° C).
The output rectifier thermistor is unplugged.
Contact authorized Miller service center.
The output rectifier thermistor is reading too low
for a valid temperature.
The control board is damaged.
Cycle power to clear error +15V or
–15V
Primary Error
The primary boost has not successfully been es-
tablished.
Cycle power to clear error. If error persists after a
power cycle, contact authorized Miller service
center.
Over Voltage
Cycle power to clear error
Primary voltage is above 288 volts. Reduce primary voltage below 288 volts.
Under Voltage
Cycle power to clear error
The primary voltage is below 150 volts. Increase primary voltage above 150 volts.
Network Error
Inverter communications down
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 authorized Miller ser-
vice center.
Network Error
Primary communications down
Network Error
UI-Control communications down
The wiring harness between the control board
and interface board is damaged.
Contact authorized Miller service center.
The control board is damaged.
Cycle power to clear error. If this error persists
after a power cycle, contact authorized Miller ser-
vice center.
The interface board is damaged.
Cable Error
Connect wire feed housing cable to
clear error
The wire feed housing cable is not attached to
either the positive stud or negative stud of the
power source.
Connect wire drive assembly cable to either the
positive or negative stud.
The control board is damaged. Contact authorized Miller service center.
Transformer Saturation Error
Release trigger to clear OR
Cycle power to clear
Main transformer has detected an overcurrent
condition.
If problem persists, contact authorized Miller ser-
vice center.
Missing UI Membrane Switch Overlay UI membrane is not detected as plugged in. Contact authorized Miller service center.
UI Membrane Switch Overlay
Doesn’t match arc controller program
Detected UI membrane is not detected as match-
ing the type reported by the main control board.
Contact authorized Miller service center.
CAN Data Version Incompatible The UI and the Control are not compatible, per-
haps due to a partial firmware upgrade.
Restart the firmware upgrade process.
Contact authorized Miller service center.