Unfortunately, if your sprinkler timer valves chatter, buzz, or make noise and may have reduced water pressure, it’s a “classic” symptom that the sprinkler timer is failing. It’ll continue to get worse over time until it stops working completely. Fortunately, it’s something we repair frequently; just send it in. Removal instructions are here.
Here is a video of common chattering, although it may buzz very fast, or be as slow as clicking once a second.
Some of the other symptoms that occur after the chattering problem gets worse and eventually the chattering stops.
If this information wasn’t enough to resolve the issue, we can help:
Send Rain Dial Timers in for repair?