Network Troubleshooting; Сhecking Transformer And Control Circuit; Communications Troubleshooting Chart - Goodman ComfortNet ASXC160**1AA Series Service Instructions Manual

SERVICING

Network Troubleshooting

The ComfortNet™ system is a fully communicating system,
and thus, constitutes a network. Occasionally the need to
troubleshoot the network may arise. The integrated air
handler control has some on-board tools that may be used
to troubleshoot the network. These tools are: red communi-
cations LED, green receive (Rx) LED, and learn button.
Refer to the Communications Troubleshooting Chart and Air
Handler Diagnostic Codes below for error codes, possible
causes and corrective actionS.
• Red communications LED – Indicates the status of the
network. The table below indicates the LED status and the
corresponding potential problem.
• Green receive communication LED – Indicates network
traffic. The table below indicates the LED status and the
corresponding potential problem.
LED
Red
Communications
LED
2 Flashes
1 Steady
Green Receive
LED
Flashing
On Solid
C
OMMUNICATIONS
LED Indication
Status
Off
Normal condition
1 Flash
Communications
Failure
Out-of-box reset
Off
No power
Communications
error
No network found
Flash
Rapid
Normal network
traffic
Data 1/ Data 2
miss-wire
• Learn button – Used to reset the network. Depress the
button for approximately 2 seconds to reset the network.
S-4 CHECKING TRANSFORMER AND CON-
TROL CIRCUIT
T C
ROUBLESHOOTING HART
Possible Causes Corrective Action(s)
None None
Communications Depress Learn Button
Failure
Verify that bus BIAS
and TERM
dipswitches are in the
ON position.
Control power up None
Learn button
depressed
No power to air Check fuses and
handler circuit breakers;
replace/reset
Open fuse
Replace blown fuse
Communications error
Check for shorts in
low voltage wiring in
air handler/system
Reset network by
depressing learn
button
Check data 1/ data 2
voltages
Broken/ disconnected Check
data wire(s) communications
wiring (data 1/ data 2
Air handler is installed
wires)
as a non-
communicating/ Check wire
traditional system connections at
terminal block
Verify air handler
installation type (non-
communicating/
traditional or
communicating)
Check data 1/ data 2
voltages
Control is "talking" on None
network as expected
Data 1 and data 2 Check
wires reversed at air communications
handler, thermostat, wiring (data 1/ data 2
or ComfortNet™ wires)
compatible outdoor Check wire
AC/HP
connections at
Short between data 1 terminal block
and data 2 wires Check data 1/ data 2
Short between data 1 voltages
or data 2 wires and R
(24VAC) or C (24VAC
common)
Notes & Cautions
None
Depress once
quickly for a power-
up reset
Depress and hold
for 2 seconds for
an out-of-box reset
None
Turn power OFF
prior to repair
Turn power OFF
prior to repair
Verify wires at
terminal blocks are
securely twisted
together prior to
inserting into
terminal block
Verify data1 and
data voltages as
described above
None
Turn power OFF
prior to repair
Verify wires at
terminal blocks are
securely twisted
together prior to
inserting into
terminal block
Verify data1 and
data voltages as
described above
39