TROUBLESHOOTING-OUTDOOR UNIT
73
NETWORK TROUBLESHOOTING
If a network communication error code has occurred, use
the following steps to help troubleshoot the system. (For net-
work communication error codes, refer to the table below
and the tables of error codes for outdoor unit and indoor
unit.)
After any wiring changes have been made or DS1 dip switch-
es on the outdoor unit control board have been changed,
apply power to the system and see if the error codes have
cleared.
1.
Confirm low voltage wiring is correct per installation in
-
structions. Check for miswiring. (i.e. Terminal 1 and 2 is
reversed.)
NOTE
: A removable plug connector is provided with the con-
trol to make thermostat wire connections. This plug may be
removed, wire connections made to the plug, and replaced.
It is strongly recommended that you do not connect more
than two wires into a single terminal in the field because
there is a risk of the wires becoming loose, which may result
in intermittent operation.
2. Check wires for damage. (i.e. Broken wire at terminal,
broken inside wire nuts or damaged cable between
units.)
3. Perform continuity check on wires to make sure cable is
OK. Replace the cable if necessary.
4. Change both dip switches of DS1 on the outdoor unit
control board to the opposite position. See image above.
The integrated control module has some onboard tools that
can be used to troubleshoot the network. These tools are:
red communications LED, green receive (Rx) LED, and the
learn button.
Red communications LED – Indicates the status of the net-
work. The table below indicates the LED status and the cor-
responding potential problem.
Green receive LED – Indicates network traffic. The table be
-
low indicates the LED status and the corresponding poten-
tial problem.
LEARN button – Used to reset the network. Press the button
for approximately 5 seconds to reset the network.
LED
D
E
L
R
O
L
O
C
e
l
b
a
b
o
r
P
n
o
it
a
c
i
d
n
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t
a
t
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e
v
it
c
e
rr
o
C
s
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a
C
Actions
Off
Normal
e
n
o
N
•
e
n
o
N
•
n
o
it
i
d
n
o
c
1
Flash
Communications
failure
• Unknown
packet
is
received
• Communications
failure
• Depress
learn
button
• Verify
wiring
connection
2
Flash
Out- of- box
reset
• Control
power
up
• Learn
button
depressed
• None
Off
No
power
Communications
error
• No
power
to
unit
• Open
fuse
• Communication
error
• Check
circuit
breakers
and
fuses;
Reset/Replace
if
needed
• Reset
network
by
depressing
learn
button
• Check
communication
wires
(terminal
1/terminal
2
wires);
Replace
if
needed
• Check
for
shorts
in
low
voltage
wiring.
1
Steady
Flash
No
network
found
• Broken/disconnected
communication
wire(s)
• Unit
is
installed
as
a
legacy/traditional
system
• Check
communication
wires
(terminal
1/terminal
2
wires);
Replace
if
needed
• Check
installation
type
(legacy/traditional
or
communicating)
Rapid
Flashing
Normal
network
l
o
rt
n
o
C
•
c
if
f
a
rt
is
“ talking”
on
network
as
expected
• None
On
Solid
Terminal
1/Terminal
2
miss- wire
• Terminal
1
and
Terminal
2
wires
reversed
at
indoor
unit,
thermostat,
or
outdoor
unit
• Short
between
terminal
1
and
terminal
2
wires
• Short
between
terminal
1
or
terminal
2
two
wires
and
terminal
C
(24VAC)
or
terminal
R
(24VAC,
COM)
• Check
communication
wires
(terminal
1/terminal
2
wires);
Replace
if
needed
Red
Communications
LED
Outdoor
unit
control
board:
(H1P)
Indoor
unit
control
board
:(H2P)
Green
Receive
LED
Outdoor
unit
control
board:(H2P)
Indoor
unit
control
board:(H3P)
