In article ,
Mark Lloyd wrote:
I have my sprinkler system set to run from 9PM to 11PM (no other
time). The control box is NOT set to come on at any other time.

4-6 am would be a better time.

Today a neighbor told me it's been coming on during the night (3 or 5
AM).

Any ideas on what I could check?

Verify with your buzzer idea. If so, the controller is broken. Replace
it.

--
Rich Greenberg N Ft Myers, FL, USA richgr atsign panix.com + 1 239 543 1353
Eastern time. N6LRT I speak for myself & my dogs only. VM'er since CP-67
Canines:Val, Red & Shasta (RIP),Red, Zero & Casey, Siberians Owner:Chinook-L
Retired at the beach Asst Owner:Sibernet-L