TROUBLESHOOTING
50
NETWORK TROUBLESHOOTING
Communications is achieved by taking the difference
between a positive dc signal and a negative dc signal. The
positive dc signal is termed “data 1” or “1”. Data 1 is positive
with respect to ground (or common). The negative dc signal
is termed “data 2” or “2”. Data 2 is negative with respect to
ground (or common).
Verify that the bus DS1 dip switches are in the ON position.
Data 1 should be approximately 2.8 volt dc. Data 2 should
be approximately 2.2 volt dc. The voltage difference between
data 1 and data 2 should be approximately 0.6 volt dc.
If the voltage difference is not .6 VDC, turn OFF DS1 switch
-
es Data 1 and Data 2. Reset Power and check for .6 DCV.
OFF
ON
1
2
The ComfortNet™ system is a fully communicating system,
constituting a network. Occasionally the need to trouble-
shoot the network may arise. The integrated control module
has some on-board 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 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 corre-
sponding potential problem.
• LEARN button – Used to reset the network. Press
the button for approximately 5 seconds to reset the
network.
LED Status
Indication
Probable Causes
Corrective Actions
Off
Nominal condition
● None
● none
1 Flash
Communications Failure
● Unknown packet is received
● Depress learn button
2 Flash
Out-of-box reset
● Control power up
● Learn button depressed
● None
Off
No power
Communications error
● No power to Outdoor unit
● Open fuse
● Communication error
● Check circuit breakers and fuses; Replace if needed
●Reset network by depressing learn button
● Check communication wires (data 1/ data 2 wires);
Replace if needed
1 Steady Flash
No network found
● Broken/ disconnected communication
wire(s)
● AC is installed as a legacy/ traditional
system
● Check communication wires (data 1/ data 2 wires);
Replace if needed
● Check installation type (legacy/ traditional or
communicating)
● Check data 1/ data 2 voltages
Rapid Flashing
Nominal network traffic
● Control is "talking" on network as expected ● none
On Solid
Data 1/Data 2 miss-wire
● Data 1 and data 2 wires reversed at indoor
unit, thermostat, or outdoor unit
● Short between data 1 and data 2 wires
● Short between data 1 or data 2 wires
● Check communication wires (data 1/ data 2 wires);
Replace if needed
● Check data 1/ data 2 voltages
LED COLOR
Red Communications LED
(H1P)
Green Receive LED
(H2P)
OUTDOOR UNIT
