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MEXANDME
07-13-2012, 08:05 AM
Long story short.

Went on a service call and found a zone going up and down. Turned the clock off. Still going up and down.

My first thought was the valve was trying to close but couldn't for some reason.

Unplugged the clock and it stopped.

Turned out the zone was getting intermittent voltage even with the clock (old Nelson model) turned off.

Duekster
07-13-2012, 08:16 AM
I have seen some stations pulse when running. Simple test is to swap some wire on zones and see if the problem follows the wire.

Even if you have a spare station terminal, I would tell the owner it is on life support and expect to replace the controller.

mrsteve
07-13-2012, 10:04 AM
You can try a hard reset, pull all power (battery too if it has one). I've had the Rain Bird modular pulse before. I don't understand this, but had a Weathermatic tech tell me to wait 24 hours with everything off on one of there controllers (something about letting the capacitor discharge). Still didn't work though.