It has been a few weeks since the first section of the watering system did not work. The first section grass slowly withered. It seems the sprinkler valve did not work. I was told that the metal based sprinkler valve normally is not easy getting damaged. unlike plastical material made sprinkler valve. As I use digital multimeter to measure the resistance value for each section from water controller on the wall, the resistance R in the section one is almost zero. I realized the solenoid kit may get short circuit. I bought a new one in about 13$ and replaced the old one. Finally it works. Instead of replace whole sprinkler valve I just replace the solenoid kit.\n\nsee following chart:\n1. removed "bug", the old solenoid kit\n[ATTACH=full]1385[/ATTACH]\n2. sprinkler valve with new solenoid kit\n\n[ATTACH=full]1386[/ATTACH]\n\n3. digital multimeter and lever-nut, wire connector\n[ATTACH=full]1387[/ATTACH]\n\n4.controller\n[ATTACH=full]1388[/ATTACH]\n\nThe tools and components I used are as following:\n1. Digital multimeter which was bought at Home Depot ([URL]https://www.homedepot.com/[/URL]\n\nsearch digital multimeter)\n2. small vise bought from Amazon\n\n3.3. Lever-nut, wire connectors from amazon\n[URL]https://www.amazon.com/Lever-Nut-Connector-Assortment-Conductor-Connectors/dp/B07871V4L8/ref=sr_1_1?m=A32VEWD8W4GHKQ&s=merchant-items&ie=UTF8&qid=1544378443&sr=1-1[/URL]\n\n\nThe root cause for the short circuit of old solenoid kit may be that the solenoid kit gets wet when it is raining...??What else could possibly cause the problem?