Underhill ICC Decoder Module Troubleshooting Guide
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Observed Field Condition
10) “I have one or more stations that won’t operate. How can I troubleshoot this field
issue?”
Possible Causes
The solenoid has reached the end of its service life
The decoder has reached the end of its service life
There is a break in the 2Wire path to this valve due to how the wire path is installed.
How to Troubleshoot
1)
Determine if the inoperable stations are in numerical order. For example
stations 07-‐11 don’t operate. If this condition exists, then a broken 2Wire com
path may exist. If the inoperable stations are random than follow steps 2-‐4.
2)
Disconnect the decoder from the valve solenoid. Using a multi-‐meter, conduct
an ohm resistance test on the valve solenoid. The reading should be 24-‐30
ohms indicating an acceptable and working solenoid. If the ohm reading is
higher, then the solenoid may require replacement. Compare this reading
against a known working solenoid before moving to the next troubleshooting
task.
3)
Disconnect the decoder and use a known working solenoid (typically a spare
service part). Temporarily disconnect the 2Wire path from the ICC decoder
module labeled L1/ L2. Connect the red and black wires of the decoder and
then connect the known working solenoid to either yellow wire. Turn this
corresponding station on via the “Manual – Single Station” function. If the
solenoid does not “buzz” then verify the decoder is programmed correctly. If
the decoder “buzzes” then you may have a broken 2Wire com wire.
4)
Look around to determine if any ground disturbance can be located that might
indicate a break in the 2Wire path. Use a digital clamp meter and portable
power supply to locate the break and repair as needed. Stringing a temporary
pair of wires from the nearest valve box to confirm the valve and decoder
operation is another alternative isolating method.
Observed Field Condition
11) “I just replaced the Underhill ICC decoder module, do I need to reprogram all of the
decoders?”
Solution
No, the station number is retained in the decoder once programmed. The default
station number of any “new” decoder is 01.
