Why the china diesel generator can't be started sometimes?

Sometimes the china diesel generator can't be started, now let's analyze the reason.
The following reasons can not start in the china diesel generator set:

1, check the battery charging capacity of the battery power is low.

2, battery wire and plug loose.

3, the spark plug can not fire. Is proposed to replace the spark plugs, because the spark plugs are consumables,

4, gas pipeline blockage for a long time, flame arrester there hoarding a large amount of water, diesel will not pass. In northern winter, or frozen.

5 diesel methane in the methane concentration is not stable, or not.

6, voltage plate, speed control board, speed sensor faults on actuators, loop. Check the equipment and relevant circuits.