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Old 04-29-2019, 09:45 PM   #1
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Low voltage on sprinkler controller


Got an old rain bird ESP-12LX controller with 11 active zones including one that will not come on. Checked voltage at controller and all 11 zones including bad one show 5 volts which seems really low. Possible that the low voltage could cause only 1 of 11 zones to not come on? Seems like they would all work or none would work since same voltage on all. Or do you think could be problem in valve box for that zone? Itís buried or covered somewhere in yard so will have to find. Does that inexpensive chat r box really work to find the valve solenoids?
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Old 05-05-2019, 02:47 PM   #2
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Re: Low voltage on sprinkler controller


You would need to measure the voltage at each solenoid. Normally the solenoids operate with 24VAC power. If all of the zones show 5 volts then you may have a bad controller.
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Old 05-05-2019, 04:53 PM   #3
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Re: Low voltage on sprinkler controller


Quote:
Originally Posted by Calson View Post
You would need to measure the voltage at each solenoid. Normally the solenoids operate with 24VAC power. If all of the zones show 5 volts then you may have a bad controller.

...or a bad AC adapter
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Old 05-23-2019, 02:22 PM   #4
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Re: Low voltage on sprinkler controller


The adapters are simple transformers with no electronic IC's to fail. They are also converting AC to AC and so no diodes as with AC to DC converters.
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