Valid trigger reaches control logic.
Fault route
WSM-315 Gas Valve Clicks But No Current Diagnostic
A WSM-315 TIG route for cases where gas control works but welding current does not start.
Quick Answer
If a WSM-315 gas valve clicks but welding current does not start, separate torch/gas timing from PWM/current command and output-stage permission.
- Gas clicking proves part of the torch/gas control path works, but it does not prove PWM or output drive is enabled.
- Check panel current command and control-board current-command output before replacing power devices.
- If HF is also absent, follow the no-HF route before output-stage replacement.
WSM-315 gas-click / no-current route
From gas evidence to current-command and output permission.
Gas valve clicks, confirming gas path action.
Current setting must be read by control board.
PWM/current command must be permitted.
Only check output stage after command evidence.
Evidence split
| Evidence | What it proves | Next direction |
|---|---|---|
| Gas valve clicks | Torch/gas output path is partly alive. | Do not assume output/PWM is enabled. |
| Current knob / panel signal | Command source may be missing or bad. | Check panel/potentiometer path. |
| HF command | If absent together with no current, timing/control may be blocked. | Use WSM no-HF route. |
| Control-board current output | Command processing may be absent. | Inspect control board before power stage. |
| Output stage response | Power stage should respond to valid command. | Check driver/inverter/output path. |
Related records
Use these to continue.