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1. No gas is emitted during ignition. When using the "fire test" button, an open flame can be applied to the igniter to check if gas is ignited. If no gas is released, inspect the main control board and solenoid valve indicator following the gas path fault troubleshooting method in section 15.3. If both components are functioning properly and there's no blockage, the issue may lie with the gas nozzle on the igniter. To diagnose, loosen the nut under the adjustment knob and place the knob in water to see if gas is present. If gas is detected here but not at the igniter, it indicates a blocked gas nozzle. The hole is very small (0.4mm), so use a thin blade from a scrap steel saw to clear the blockage. 2. Is the ignition control working correctly? Carbon buildup on the spark plug can prevent it from igniting, so it should be cleaned. Next, check the high-voltage modules connected to the spark plug, including their wiring and connectors. The input voltage should be DC 3V (from two regular batteries). The two output wires of the high-voltage module (separated by 2–10 mm) should generate a spark. If no spark is produced, the high-voltage module may be damaged. 3. Gas is present during ignition, and the spark plug sparks, but the system still fails to ignite. This usually happens when the gas concentration is too high. It’s difficult to ignite properly, especially with gases like natural gas or propane. Adjust the "adjustment knob" to reduce the gas concentration and resolve the issue. 4. The spark plug doesn’t ignite during the process. During ignition, there should be a visible spark between the spark plug and the igniter body, along with a distinct sparking sound. If no spark occurs, first verify that the main control board’s ignition indicator lights up for 1–2 seconds when the “test” button is pressed. Check the spark plug for carbon buildup and clean it if necessary. Then, inspect the high-voltage modules, wiring, and connectors. Ensure the input voltage is DC 3V and that the output wires can produce a spark. 5. Gas is present during ignition, and the spark plug is firing, but the system still won’t ignite. This is often due to excessive gas concentration. It’s common with gases like natural gas or propane. Adjust the "adjustment knob" to regulate the gas flow and achieve proper ignition. 6. Additional tips: Always ensure all connections are secure and free from corrosion. Regular maintenance and cleaning of components can prevent many common issues. If problems persist after checking these areas, consider consulting a professional technician for further diagnosis.