Underhill ICC Decoder Module Troubleshooting Guide
4
b.
Without the 2Wire communication wire connected to “L1/L2” terminals,
turn on Station 01 in Manual mode. Use a multi-‐meter to confirm 26-‐28
volts AC across the “L1/L2” connectors. The RED “Error” LED should be
illuminated during this test. To clear the RED LED, press the RESET button
and hold for approximately 10 seconds.
c.
Re-‐connect the 2Wire path and re-‐try operating a station in Manual mode
from the ICC controller. If the station does not operate, remove a decoder
from a valve box (assuming it has already been programmed) and connect
the red and black decoder wires into the “L1 / L2” terminals on the ICC
Decoder module. Temporarily disconnect the existing 2Wire pair from the
L1/L2 terminal. Using a spare solenoid, connect the yellow wires to the
solenoid per the diagram on the next page. Actuate the decoder and
solenoid in Manual mode from the controller for the station number written
on the decoder. If the solenoid operates, the ICC Decoder Module is
operating ok. If it does not operate verify steps 2-‐4 below.
Measure AC volts across
L1/L2 terminals when a
station is operating
