Underhill ICC Decoder Module Troubleshooting Guide
10
into the L1/L2 terminals. Connect the decoder’s yellow wires to a known
operable solenoid and manually operate this station. If the solenoid “buzzes”
then the ICC decoder is most likely working.
If both the ICC controller and ICC decoder operate, then an issue may lie with the
2Wire communication cable. To isolate where the field issue lies, locate station 01 and
disconnect the 2Wire path downstream of this valve. Operate station 01 manually
from the controller. If the solenoid does not operate, then there is a break in the 2Wire
path between the controller and the first valve. Look to see if you see signs of surface
disturbance from gophers, a removed shrub or tree or signs of recent trenching that
might be associated with the 2Wire path.
If station 01 does operate, then move to station 03 and repeat the process. If station
03 operates move a few more stations downstream. If station 03 doesn’t operate then
move to station 02 and try again. Underhill recommends using a “Digital Clamp
Meter” p/n TW-‐DCM along with a “Faulting Transformer” p/n TRANSFRMR-‐115 as
diagnostic tools for field wire issues.
Observed Field Condition
7) “I’m having difficulty in programming a decoder beyond 32 stations.”
Possible Causes
The Hunter ICC controller and the Underhill ICC decoder module are not synchronized
or something has occurred to the programming function in the ICC decoder module.
How to Troubleshoot
1)
Turn the Hunter main menu knob to “Manual-‐Single Station.” Press and hold the
“left” arrow button and view the display. If it says 32, then disconnect the 120-‐volt
power to the ICC controller. This may involve unplugging the power cord, or
removing the power module – whichever is easiest. Then remove the 9-‐volt back-‐
up battery and the ICC decoder module. Re-‐insert the ICC decoder module, then re-‐
apply 120-‐volt power to the controller and recheck the number of stations in the
“Manual-‐Single Station’ menu. Now program the decoder(s) as needed.
2)
Once a decoder is programmed, verify it’s operating by removing the two red and
black wire leads from the “speaker-‐wire” programming connections and re-‐
connect them to the L1/L2 terminals. Then connect a working solenoid to the two
yellow wires. Operate this station manually and verify the solenoid buzzes. If it
doesn’t, then try to operate the station manually as station 01. If the solenoid
buzzes, then the decoder was not programmed properly to initially. Re-‐program
and re-‐test. Periodically, you may find the decoder will simply not program. If a
second ICC decoder module on another controller is close by, repeat the
programming steps or use an Underhill Portable Programmer p/n DEC-‐PROG-‐115
as an alternative solution.
