Underhill ICC Decoder Module Troubleshooting Guide
20
Observed Field Condition
19) “Stations 1-‐6 operate ok, but when station 07 is operated manually, other stations
higher than 07 will operate at the same time.”
Possible Causes
Station 07 decoder has failed and is sending errant messages down the 2Wire path
when operated.
Another decoder higher than station 07 has also failed and this portion of the 2Wire
path might be “looped”.
How to Troubleshoot
1)
Locate station 07 in the field. Temporarily disconnect station 07 decoder and
re-‐attach the 2Wire path essentially bypassing station 07.
2)
Operate station 08 and others and confirm they operate individually. If they do,
then replace station 07 decoder.
3)
While station 07 decoder is disconnected conduct an ohms test on the solenoid
corresponding to station 07. A value of 24-‐65 is considered normal, but if you
observe a value 95 and above, replace the valve solenoid at the same time.
4)
Confirm if possible, the 2Wire path is a single leg and does not reconnect or
loop back onto it self. If a loop is found, temporarily disconnect and bypass
other station decoders until the field issue is isolated.
