Valid trigger starts the sequence.
Fault route
WSM-315 No HF Arc Start Diagnostic
A WSM-315 no-HF arc-start route that separates timing/control evidence from HF-board hardware.
Quick Answer
For WSM-315 no HF arc start, separate torch input, gas output, HF command, HF relay/HV pack and arc-transfer evidence before replacing the HF board.
- If gas does not open, start with torch input and gas-control output instead of HF board.
- If gas opens but HF command is missing, inspect control-board output or timing logic.
- If HF command exists but no HF appears, move to HF relay, HV transformer/pack and discharge path.
WSM-315 no-HF route
Gas/control evidence first, HF hardware second.
Gas should open before HF start.
Control board should command HF during start phase.
HF board must switch and generate start energy.
HF stops after arc transfers to main current.
No-HF evidence table
| Evidence | If normal | If abnormal |
|---|---|---|
| Torch input | Continue to gas output. | Repair torch switch or connector. |
| Gas output | Continue to HF command. | Diagnose gas timing/control output. |
| HF command | Move to HF board hardware. | Diagnose control board or timing logic. |
| HF relay / HV pack | Check arc-start lead and discharge path. | Repair HF board/hardware. |
| Arc transfer | HF should stop after start. | If HF stays on, use stuck-HF route. |
Related records
Open based on failed evidence.