Check the torch switch and two-core trigger input.
Fault route
LGK60L Torch Trigger But No Gas Diagnostic
A gas-valve control route for LGK60L plasma cutters when the torch trigger does not open gas flow.
Quick Answer
If pressing the LGK60L torch does not open gas, separate torch-switch input, gas-valve socket output, solenoid valve and HF/control board path.
- First confirm the torch switch actually reaches the control/HF board input.
- Then check whether the gas-valve socket receives a control output.
- If output exists but gas does not flow, inspect solenoid valve and gas supply path.
Use this page when
- Torch trigger is pressed but no gas comes out.
- The machine has control power and torch input can be checked.
- You need to decide between switch, board output, solenoid and gas supply.
Do not use this page when
- Gas flows constantly after power-on.
- External gas source is disconnected.
- The machine has no control power.
LGK60L trigger-no-gas route
Signal input first, output supply second, valve/gas path third.
Confirm the board sees the trigger request.
Check whether output appears at the gas-valve connector.
If output exists, inspect valve coil and gas path.
If no output after valid trigger, inspect gas-control driver/relay.
No-gas evidence table
| Evidence point | Expected / abnormal evidence | Repair direction |
|---|---|---|
| Torch switch | Open switch or wiring prevents gas command. | Repair torch switch or connector wiring. |
| Board trigger input | Trigger does not arrive at board. | Trace switch socket and harness. |
| Gas-valve socket | No gas-valve output despite valid trigger. | Inspect HF/control board gas-control section. |
| Solenoid valve | Board output exists but valve does not open. | Replace solenoid valve or repair gas path. |
| External gas source | No upstream gas supply. | Correct gas supply before board repair. |