Fault index
TIG Welder Fault Index
A practical TIG troubleshooting index that routes users from visible symptoms to gas, HF, current-control, panel, remote and secondary-inverter pages.
Start here
Use this index when the first symptom is TIG-specific: torch switch no response, gas timing wrong, no HF, HF stuck on, HF present but no current, current cannot adjust, foot pedal not working, AC output missing or pulse/balance abnormal.
Gas and HF sequence
The normal sequence is torch input → pre-flow gas → HF command → arc transfer → current hold → post-flow gas. A fault in one layer can look like another layer, so users should follow the sequence before replacing the HF board.
Current and control
For current-control faults, separate panel/remote command, control-board processing, feedback path and power-stage response. For AC/DC WSE faults, also separate primary output from secondary inverter switching.