Question
I have a Richdel 476Pri sprinkler system with 4 stations. All stations are set to 12 minutes each but recentlt the 4th station will only stay on for 5 minutes and shut down regardless of what time is set. I am going to unplug the main power to the control to reset but is there anything else that could be causing that if that doesn't work?
Thank you

Answer
Check the voltage at the port on the timer. TO do disconnect the wire from port 4 and disconnect the common wire (usually one white in a port marked C) turn on the station 4 and use a multimeter to see the volts at port 4 should be 24V or a little more if the controller keeps the volts more than 5 min the problem could be the selenoid, check it for cracking where the wire enters the selenoid body, replace the selenoid(it cost about $ 8) check the selenoid socket for cracking. If the problem continues probably is a faulty valve, open and clean it carefully. (go to irrigationtutorials.com to see how to do this).

good luck
Guillermo