Check whether valve is mechanically stuck open.
Fault route
MIG200DL Gas Flows Immediately After Power-On Diagnostic
A MIG200DL gas-control route for gas flow that starts immediately after power-on.
Quick Answer
For MIG200DL gas flow immediately after power-on, the source workflow treats the power board as the direct suspect. The useful diagnostic split is whether the gas valve is mechanically stuck or P17/board output is stuck active.
- If gas flows without trigger, do not confuse it with trigger-no-gas.
- Separate mechanical valve leakage from board-side DC24V command stuck active.
- If P17 output is stuck active, inspect the power-board gas-control section.
Use this page when
- Gas begins flowing after power-on without pressing torch trigger.
- Machine is otherwise normal enough for gas-control checks.
- P17 or valve command path can be measured.
Do not use this page when
- Gas does not open when trigger is pressed.
- External gas regulator is the only issue.
- The machine has no power.
MIG200DL power-on gas-flow route
Board output stuck active vs solenoid stuck open.
Determine whether gas-valve DC24V is active without trigger.
If board-side output is stuck active, inspect/replace power board gas-control section.
Power-on gas evidence table
| Evidence point | Expected / abnormal evidence | Repair direction |
|---|---|---|
| Gas valve mechanics | Valve leaks or remains open without command. | Replace gas valve. |
| P17 gas output | DC24V output active without trigger. | Inspect power board gas-control output. |
| Power board | Source route points to power board for power-on gas flow. | Repair/replace power board after valve isolation. |