Nelweld Operations and Service Manual
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6.2 Diagnostic codes – Troubleshooting Guide
The diagnostic codes can be accessed via the F1 Special Function Mode. The E codes can be scrolled with
the up/down keys next to the LED Display. The error codes are erased when the unit is shut off.
Diagnostic
Code
Description Recommended Action
E001 Line Frequency Error Invalid frequency detected. Ensure the proper line frequency is being used.
E002 Missing Phase
Phase B or C (with respect to Phase A) was not detected. Ensure that all input power
phases are present.
E005 EEPROM Failure Main Control PCB failure.
E006
Dual Output
Communications Error
Check harness connections between control PCB’s.
E007
Gun Coil or Gun Cable
Shorted to Work
Check gun coil wiring, or gun control cable for broken insulation or water immersion
of a gun control connector.
E008 Gun Coil Open Check gun coil wiring and related circuit wiring
E009 Gun Lift Error A short was detected after the pilot arc time expired – Check gun.
E010 Shunt Signal Open No pilot arc current detected and/or the arc current went out. Check shunt wiring.
E012 Time Control Fault Main weld arc went out. Clean surface or change weld parameters.
E015
High Temperature
Fault
Welding is disabled until the unit’s welding power supply cools to an acceptable level.
This code will display automatically with or without F1 diagnostic mode enabled.
This error will occur if the pilot arc board is unable to supply 15VDC. The 15VDC
supply exists if two green LEDs on the pilot arc board are lit. If they are not lit,
replace the pilot arc board(s).
E016 SCR Shorted Check shunt wiring. Replace defective SCR.
E017 Weld Quality Error
Weld was outside of specified tolerance. Only valid for Process Monitor users. See
the Nelware users manual for details.
E018 Security Error An incorrect security code was passed to the Nelweld through the RS-232 port.
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