Ystem Roubleshooting - Goodman GDVC80703B Installation Instructions Manual

C C C C C O M F O M F O M F O M FO R O M F O R O R O R O RT N E T ™ S Y T N E T ™ S Y T N E T ™ S Y T N E T ™ S Y T N E T ™ S YS T E M
The ComfortNet system is a fully communicating system, and thus,
constitutes a network. Occasionally the need to troubleshoot the
network may arise. The integrated furnace control has some on-
board tools that may be used to troubleshoot the network. These
tools are: red communications LED, green receive (Rx) LED, and
learn button.
• Red communications LED – Indicates the status of the
network. The table below indicates the LED status and
the corresponding potential problem.
• Green receive LED – Indicates network traffic. The table
below indicates the LED status and the corresponding
potential problem.
LED LED
Status
Off
1 Flash
Red
Communications
LED
2 Flashes
Off
1 Steady
Flash
Green Receive
LED
Rapid
Flashing
On Solid
S T E M S T E M S T E M S T E M
Indication Possible Causes
Normal condition None
Communications Communications
Failure Failure
Out-of-box reset Control power up
Learn button
depressed
No power No power to furnace
Communications Open fuse
error
Communications error
No network found Broken/ disconnected
data wire(s)
Furnace is installed as
a legacy/ traditional
system
Normal network Control is "talking" on
traffic network as expected
Data 1/ Data 2 Data 1 and data 2
miss-wire wires reversed at
furnace, thermostat,
or CT™ compatible
outdoor AC/HP
Short between data 1
and data 2 wires
Short between data 1
or data 2 wires and R
(24VAC) or C (24VAC
common)
• Learn button – Used to reset the network. Depress the
button for approximately 2 seconds to reset the network.
S S S S S T T T T T
YSTEM YSTEM YSTEM YSTEM YSTEM ROUBLESHOOTING ROUBLESHOOTING ROUBLESHOOTING ROUBLESHOOTING ROUBLESHOOTING
NOTE: NOTE:
NOTE: NOTE: Refer to the instructions accompanying the CT compatible NOTE:
outdoor AC/HP unit for troubleshooting information.
Refer to the Troubleshooting Chart in the Appendix for a listing of
possible furnace error codes, possible causes and corrective ac-
tions.
Corrective Action(s)
None
Depress Learn Button
Verify that bus BIAS
and TERM
dipswitches are in the
ON position.
None
Check fuses and
circuit breakers;
replace/reset
Replace blown fuse
Check for shorts in
low voltage wiring in
furnace/system
Reset network by
depressing learn
button
Check data 1/ data 2
voltages
Check
communications
wiring (data 1/ data 2
wires)
Check wire
connections at
terminal block
Verify furnace
installation type
(legacy/ traditional or
communicating)
Check data 1/ data 2
voltages
None
Check
communications
wiring (data 1/ data 2
wires)
Check wire
connections at
terminal block
Check data 1/ data 2
voltages
32
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