Trane IntelliPak I Programming, Troubleshooting Manual page 122

System Testing & Troubleshooting
REMOTE HI COMMUNICATIONS LOSS
CHECK COMM LINK WIRING TO UNIT NUMBER 3
If one of these messages appear on the Human Interface screen, the
link is noisy or there is another Human Interface of the same type on
the link.
IMPROPER HUMAN INTERFACE CONFIGURATION
MORE THAN ONE LOCAL HI ON LINK
OR
IMPROPER HUMAN INTERFACE CONFIGURATION
MORE THAN ONE REMOTE HI ON LINK
122
Used With: All Units with Remote
Human Interface
Possible Values: Unit Number 1
through 4
Problem: The Remote Human
Interface has lost communications
with the unit whose number is
specified (#3 in this example).
Check: Field/unit wiring between
Remote Human Interface and the
IPCB on the unit number specified.
Also, verify wiring between the IPCB
and RTM of the unit whose number
is specified. Verify crimping and
polarity of communications wiring.
There should be no loose
connections or crimps on wire
insulation.
Used With: All Units with Local HI
Problem: Noisy Communications
link or a second Local HI has been
installed on the link.
Check: Wiring between Unit
Mounted (Local) Human Interface
and RTM. Verify crimping of
communications wiring. There
should be no loose connections or
crimps on wire insulation. If a
Remote HI was installed, verify that
a Local HI was not installed by
mistake.
Used With: All Units with Remote
Human Interface
Problem: Noisy Communications
link or a second Remote HI has been
installed on the link.
Check: Field/Unit wiring between
Remote Human Interface and the
IPCB and RTM. Verify crimping of
communications wiring. There
should be no loose connections or
crimps on wire insulation. Verify that
no other Remote HI's have been
connected to the same
communications link/unit.
RT-SVP04F-EN