With all of the computerized sprinkler controllers available at a reasonable cost I don't see why anyone would still use the old controller that came with the house. The rain sensor will usually last about 5 years until the little sponge material dries out and the sensor stops working. With the new computerized units they use the weather available on the internet to determine when your lawn should be watered.
Personally, I like the Rachio 3.
Call Chuck, he can install one for you if you can't do it yourself.
Chuck Grospitch
chuck.grospitch@gmail.com
440-823-4273