Mr. Hu has been using natural gas for cooking since a couple of years ago. A few days ago, the left burner of his gas stove suddenly failed to ignite. Initially, he thought it was a natural gas issue, but after trying the right burner, he discovered the problem was elsewhere.

Mr. Hu repeatedly attempted to turn on both switches and discovered an odd pattern: first, he turned on the right stove, followed by the left, at which point the left stove could ignite a flame. However, when he turned off the right stove, the left stove extinguished as well.

For a period of time afterward, Mr. Hu cooked meals exclusively on the right stove at home. In the event of guests visiting, he had to resort to a lighter to ignite the flame, which was quite dangerous.

A few days ago, Mr. Hu finally decided to repair the gas stove. As there was no one at home in the morning, upon Mr. Hu's request, Master Hu arrived for service as scheduled in the afternoon.

Hu师傅 first turned on the switches on both sides of the gas stove to check, and the ignition situation was indeed consistent with Mr. Hu's description. The left stove was difficult to ignite, and even failed to ignite. Hu师傅 removed the outer shell of the gas stove and inspected the various parts inside. At this point, he observed that there were adhesive marks on the ignition needle.

Mr. Hu explains that this gas stove is not the first time it has failed to ignite. Even when it first couldn't ignite, he noticed a large crack on the ignition needle. Not knowing what to do, he patched up the crack with glue. To his surprise, it accidentally fixed the stove.

"This is where the fault lies," Master Hu said. "The ignition needle has broken, and the flame it emits cannot contact the spark plug to ignite. Replacing the ignition needle will resolve the issue."