Fault route · WSM-315 TIG
WSM-315 no HF / no arc fault routing
Use this workflow when a WSM-315 TIG welder powers on but fails to start correctly: no gas, gas but no HF, HF but no welding current, foot pedal does not start, or current control behaves incorrectly. Diagnose by the first missing action in the start sequence.
Start from the first missing action
| First missing action | Start here | Then check |
|---|---|---|
| No gas, no HF, no output | Torch/pedal input, 24V/control rail, mode selection | Panel board connector, control-board start input and gas relay output. |
| Gas works, no HF | HF enable signal and HF board relay path | HF relay coil/contact, transformer, discharge path and HF cable. |
| HF works, no main arc | Main output enable and current-feedback path | Drive enable, inverter output, secondary rectifier, work clamp and torch path. |
| Foot pedal no response | Remote contactor and remote current lines | Pedal pot, remote switch, panel connector and control-board remote input. |
| Protection light on | Thermal, feedback and output-stage protection | Thermal switch, current feedback, power-stage short and auxiliary rails. |
| Post-flow wrong | Panel setting and gas timing logic | Gas solenoid output, timing network and control-board release path. |
Diagnostic route
1. Mode and triggerConfirm TIG mode, 2T/4T, local/remote and torch/pedal switch input.
2. Gas outputCheck solenoid command and actual gas flow.
3. HF enableCheck whether HF board receives a timed command.
4. Main outputCheck drive enable and output path after HF starts.
5. Feedback/cutoffCheck current feedback and HF cutoff after arc transfer.
6. Panel settingsCheck current, pulse, post-flow, down-slope and remote command.
Most useful bench note
Write down exactly what happens after torch press: gas click, gas flow, HF sound, output voltage/current, protection lamp and post-flow. That sequence usually points to the correct board faster than random component replacement.