Yes The door-to-door detection of natural gas requires mobile phone signature and document signature, which can confirm that the detection of natural gas has been completed and there is no potential safety hazard at home. The project includes checking whether the light oil filter is clean, whether the ignition gas circuit is tight, whether the oil supply pipeline is unblocked, whether the water level gauge and pressure gauge elbow are flushed up to standard, whether the fire detector cleans the light receiving surface, and carefully observing whether the working pressure of the oil pump and the combustion flame are normal.