Long press the "Set" or "Up" button to enter the starting voltage setting mode. Use the buttons to adjust the value and wait for it to flash to save.

| Symptom | Likely Cause | Solution | | :--- | :--- | :--- | | | No 12V power, or polarity reversed | Check VCC/GND wiring. The board has reverse polarity protection, but it may blow a fuse. | | Pulse light flashes, but no weld | MOSFET gate not connected to Pulse+/- | Wire the Gate of your FET board to Pulse+. Do not rely on shoddy jumper wires. | | Welds are burning holes | Pulse time is too high for nickel thickness | Reduce time to 1.5 ms and test on scrap metal. | | Welds are too weak (pop off) | Pulse time too low, or capacitor bank voltage sag | Increase time by 0.5 ms increments. Ensure caps are fully charged (5V-12V depending on build). | | Welder fires continuously | Trigger wires are shorted or encoder is stuck | Disconnect foot pedal. If problem persists, the MOSFET may be blown. | | Erratic timing / Screen flickers | 12V supply is unstable (cheap LED driver) | Use a regulated power supply or a small 12V lead-acid battery. |

For detailed visual walkthroughs or specific wiring diagrams, you can find various XH-M608 guides on Amazon or AliExpress listings . Voltage Protection Board XH-M608 - Make Electronics