Underhill ICC Decoder Module Troubleshooting Guide
12
Observed Field Condition
9) “There are two solenoids sharing a single decoder. All other stations operate, but
neither one of these valves will operate in a Manual or scheduled irrigation mode.”
Possible Causes
One of several issues may have occurred:
1)
The decoder has failed or is not programmed to the corresponding station
number on the controller’s station output.
2)
One or both of the solenoids has failed
3)
There is a field wiring issue in the 2Wire communication cable between the
controller and this station. There could be a splice in the 2Wire path off of the
main 2Wire com path run to this station specifically.
How to Troubleshoot
Each of the three possible causes can be diagnosed in the following order;
1)
Removed the corresponding decoder from the two valve solenoids and bring
back to the controller. Temporarily disconnect the 2Wire com cable wires from
L1/L2 and connect the black and red wires of the decoder into either one of
these connections. Attach the two yellow wires of the decoder to a known
working solenoid. Attempt to operate the corresponding station number
manually from the Hunter ICC controller. If the solenoid does not “buzz”, then
try a working decoder. You might also re-‐program the decoder to the
corresponding station number and retry step #1.
2)
If the solenoid buzzes, then isolate the mainline and remove both solenoids
from the field where the decoder was originally installed. Connect one of the
solenoids to the decoder still attached to the L1/L2 terminals. Attempt to
operate this station manually. If the solenoid “buzzes”, then retry with the
second solenoid. If it too “buzzes” then wire them both. If both “buzz” then go
to #3. If one solenoid “buzzes” and the other does not, replace the solenoid that
did not originally “buzz”.
3)
If both solenoid “buzzed” in #2 but won’t once re-‐installed in the valve box, then
a problem exists in the two-‐wire path somewhere between the controller and
this set of valves. Purchase a digital clamp meter Underhill p/n TW-‐DCM and
portable power supply Underhill p/n TRANSFRMR-‐115 to locate the field issue.
