Network Troubleshooting; Communications Troubleshooting Chart - Daikin ComfortNet DX16TC Series Service Instructions Manual

SERVICING

Network Troubleshooting

The ComfortNet™ system is a fully communicating system, and
thus, constitutes a network. Occasionally the need to trouble-
shoot the network may arise. The integrated air handler con-
trol 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. Refer to the Communica-
tions Troubleshooting Chart and Air Handler Diagnostic Codes
below for error codes, possible causes and corrective actionS.
LED LED
Status
Off
1 Flash
Red
Communications
LED
2 Flashes
Off
1 Steady
Flash
Green Receive
LED
Rapid
Flashing
On Solid

COMMUNICATIONS TROUBLESHOOTING CHART

Indication Possible Causes
• Normal • None
condition
• Communications • Communications Failure
Failure
• Out-of-box reset • Control power up
• Learn button depressed
• No power • No power to air handler
• Communications • Open fuse
error
• Communications error
• No network • Broken/ disconnected data wire(s)
found
• Air handler is installed as a non-
communicating/ traditional system
• Normal network • Control is "talking" on network as
traffic expected
• Data 1/ Data 2 • Data 1 and data 2 wires reversed
miss-wire at air handler, thermostat, or
ComfortNet™ 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)
• 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 corre-
sponding potential problem.
• Learn button – Used to reset the network. Depress the but-
ton for approximately 2 seconds to reset the network.
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 air handler/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 air handler installation
type (non-communicating/
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
36
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