- Check the surface of the smoke sensor for flower marks or dirt, and check that the package is adequately protected (to prevent dust from covering the interior of the smoke sensor);
-Check whether there are flower marks or dirt on the surface of the smoke sensor, and check whether the package is adequately protected (to prevent dust from covering the inside of the smoke sensor);
-Check the surface of the smoke sensor for flower marks or dirt, and check that the package is adequately protected (to prevent dust from covering the inside of the smoke sensor);