Underhill ICC Decoder Module Troubleshooting Guide
5
d.
Once the Decoder is removed from the valve box, conduct an ohms test on the
existing valve solenoid to confirm is functional. Using a multi-‐meter, select
the “Ohms” test position. The Ohms symbol is shown here as “ “.
Connnect the black and red leads of the multi-‐meter to the open wires on the
solenoid, (the order is not important). A typical solenoid will display a
resistance value of 24 -‐65 Ohms. As a solenoid reaches end of life it will have
more resistance that may be displayed as 100 Ohms or higher. Replace the
solenoid if needed.
e.
If after attempting steps 3-‐4 without success,
remove AC power and the 9-‐
volt back-‐up battery (if it exists)
from the ICC controller. Remove the ICC
Decoder Module and locate the 7 (qty) Philips headed fasteners on the
inside of the ICC controller as shown in the photo below. Remove the
plastic-‐molded inner shell and locate the metal tab in the position where
the Decoder Module is to be installed. Using a small pair of needle-‐nose
pliers bend the tab upwards slightly then replace the plastic-‐molded cover.
Re-‐install the 7 (qty) fasteners and press the Green “Accept” LED again
following the steps outlined in (a) above.
Typical Philips
head fastener
