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Sprinkler control box appears fine, but sprinklers to not open

The sprinkler control box (Rainbird ESP-6si) looks as though everything is fine. It is powered and programmed correctly. It starts with zone 1 right at the scheduled time, and counts down correctly for each zone. However, none of the sprinkler heads ever opens up. This problem happend all of a sudden after the system had been previously working fine. Thanks for any help!

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If all zones do not open, I would check the water supply first. Verify that the water is indeed on. If you have water at each valve location, then I would check at the wiring at the controller. Use a Multi-meter & check the resistance (ohms) between the common wire terminal and the wires at the terminal for zones 1 through 6. If you get an open loop (O.L.) reading on all zones, I would think the common wire is cut or disconnected. Also look for a rain sensor that could be wired into the common wire. If it is faulty or stuck, it could cause an O.L. in the wiring. If a rain sensor is wired in at the controller, disconnect it from the common wire path and connect the common wire directly back to the common terminal. If it works now, then you have a bad rain sensor.
A normal reading should be 20 – 60 Ohms from the common terminal to any zone wire. If you are in that range, the only other thing it can be is the output voltage from the controller to the valves. Use a Multi-meter & check the voltage at 24VAC terminals where the external transformer is connected. You should have 24-30VAC. Next, open zone 1 and check the voltage between the common wire terminal and the terminal for zone 1. You should have the same reading as you got for the transformer. If you have nothing or a large difference, then I would suspect the controller might be damaged.
Remove the power & 3 volt lithium battery and wait 2-3 minutes, then reprogram the controller and try again. Good luck!

Posted on Jul 28, 2009

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Posted on Jan 02, 2017

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