Installation Instructions

13
NETWORK TROUBLESHOOTING
Verify that the bus TERM dipswitches are in the ON position.
1
2
OFF ON
TERM
TERM
The ComfortNet™ system is a fully communicating system which
operates over a communicating network. Occasionally the need
to troubleshoot the network may arise. The integrated control
module has some on-board tools that may be used to trouble-
shoot 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.
• LEARN button - Used to reset the network. Depress the
button for approximately 2 seconds to reset the network.
SYSTEM T ROUBLESHOOTING
NOTE: Refer to the instructions accompanying the CT compatible
indoor air handler/furnace/modular blower unit for
troubleshooting information.
Refer to the Troubleshooting Chart at the end of this manual for a
listing of possible air conditioner and heat pump error codes,
possible causes and corrective actions.
LED LED Status Indication Possible Causes Corrective Action(s) Notes & Cautions
Off • Normal condition • None • None • None
• Depress once quickly for a
power-up reset
• Depress and hold for 2
seconds for an out-of-box
reset
• Control power up
• Learn button depressed
• No power • No power to furnace • Check fuses and circuit
breakers; replace/reset
• Communications error • Open fuse • Replace blown fuse
• Communications error • Check for shorts in low
voltage wiring in
furnace/system
• Reset network by
depressing learn button
• Check data 1/ data 2
voltages
• Broken/ disconnected data
wire(s)
• Check communications
wiring (data 1/ data 2
wires)
• Turn power OFF prior to
repair
• Furnace is installed as a
legacy/ traditional system
• Check wire connections at
terminal block
• Verify wires at terminal
blocks are securely twisted
together prior to inserting
into terminal block
• Verify furnace installation
type (legacy/ traditional or
communicating)
• Check data 1/ data 2
voltages
Rapid Flashing • Normal network traffic • Control is “talking” on
network as expected
• None • None
• Data 1 and data 2 wires reversed
at furnace, thermostat, or CT™
compatible outdoor AC/HP
• Check communications
wiring (data 1/ data 2
wires)
• Turn power OFF prior to
repair
• Short between data 1 and
data 2 wires
• Check wire connections at
terminal block
• Verify wires at terminal
blocks are securely twisted
together prior to inserting
into terminal block
• Short between data 1 or
data 2 wires and R
(24VAC) or C (24VAC
common)
• Check data 1/ data 2
voltages
2 Flashes • Out-of-box reset • None
1 Flash • Communications Failure • Communications Failure
• None
Green Receive LED
Off • Turn power OFF prior to
repair
1 Steady Flash • No network found
On Solid • Data 1/ Data 2 miss-wire
Red Communications
LED
• Depress Learn Button
COMMUNICATIONS TROUBLESHOOTING CHART