Fault index
Gas HF No Output Fault Index
A process-support index for gas valve, HF start, arc transfer and main-output faults.
Start here
Use this index when the machine shows gas, HF or start-sequence symptoms: no gas, gas flows but no HF, gas and HF present but no current, HF stuck on, HF present but no arc transfer, or gas stops too early.
Main principle
Gas and HF are support paths. They can prove the torch/timing layer is partly alive, but they do not prove PWM/current permission, main output, work return or feedback are healthy.
Routing logic
No gas points to torch input, timing, gas driver, solenoid or gas supply. No HF after gas works points to HF command or HF board. HF present but no current points to current permission, driver/output path or protection shutdown.
Start from these records
TIG gas solenoid control pathOpen related WelderData record.TIG HF arc-start sequenceOpen related WelderData record.Gas flows but HF missingOpen related WelderData record.Pre-flow/HF works, no currentOpen related WelderData record.HF present, current drops outOpen related WelderData record.HF stuck on after arc startOpen related WelderData record.CT-312 HF present, no arc transferOpen related WelderData record.WSM-315 no HF arc startOpen related WelderData record.