I have a question about a Hunter Mini-Click Rain Sensor. It shuts the stations off when I operate it manually (pressing down on the post/trigger), but when I ran it the other day during a good rainstorm (at least 1/2" of water) it didn't shut off the stations. The wiring is sound and connected properly. Its hooked up to an ESP-4 from 2004. I have the sensor set for 1/2" rainfall. When I tested it, the corks were allready saturated from a weekend of rain. I can't find any kind of date on the Mini...