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The Brain

An irrigation tech knowledge base, by BoardTronics.

Topics include troubleshooting, how-to's, and more!

ISSUE:

Receiver/Decoder Module is not responding to commands/LEDs are not flashing

  • Check that the pager is installed correctly and the pins connecting to the Receiver/Decoder Module are not bent or broken. When installing the pager, ensure the pins are aligned and the pager is secure in the Receiver/Decoder Module.
  • Verify radio communication:
    • Change your address to 0 (all address switches must be in the "OFF" position).
    • From a Handheld Irrigation Radio, run the following command sequence: *9 000 7540. This command turns off all water for this selected Receiver/Decoder Module.
    • Watch for red blinking LED. If there is no LED activity, there is a communication problem with the Receiver/Decoder Module and it may need to be replaced with a new one.
    • If the LED blinks, verify that all address switches work by changing all of them from the OFF to ON position. (channel 255)
    • From a handheld radio, run the sequence again: *9 255 7540.
    • If there is no LED activity, one of the address switches is faulty and the Receiver/Decoder Module may need to be replaced with a new one.
    • If there is LED activity after running the command, continue on.
  • Check for corrosion on any of the connectors or jumper pins. Also, make sure there are no parts on the Receiver/Decoder Module that are hot to the touch.
  • Reset the Receiver/Decoder Module by removing the tin metal covering on the module. You will then see a 3-pin jumper with the right two jumpers shorted. Pull the jumper off and make it so the left two pins are connected. Power on the Receiver/Decoder Module, wait a few seconds, and power it down. Finally, remove the jumper and place it on the right two pins - where it was originally.
  • The red LED should come on 5-10 seconds after power is applied. If there is no activity with the output boards, the Receiver/Decoder Module may need to be replaced with a new one.