73
N
ETWORK
T
ROUBLESHOOTING
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).
Data 1 should be approximately 2.8 volts dc. Data 2 should be
approximately 2.2 volts dc. The voltage difference between data 1
and data 2 should be approximately 0.6 volts dc.
Verify that the bus DS1 dip switches are in the ON position.
TERM
OFF ON
1
2
The ComfortNet™ system is a fully communicating system, consti-
tuting a network. Occasionally the need to troubleshoot the net-
work 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 corresponding potential
problem.
• LEARN button – Used to reset the network. Depress the button
for approximately 5 seconds to reset the network.
TROUBLESHOOTING
OUTDOOR UNIT ERROR CODES
LED Status
Indication
Probable Causes
Corrective Actions
Off
Nominal condition
●
None
●
none
1 Flash
Communications Failure
●
Unknown packet is received
●
Depress learn bu on
2 Flash
Out-of-box reset
●
Control power up
●
Learn bu on depressed
●
None
Off
No power
Communications error
●
No power to Outdoor unit
●
Open fuse
●
Communica on error
●
Check circuit breakers and fuses; Replace if
needed
●
Reset network by depressing learn bu on
●
Check communica on wires (data 1/ data 2
wires); Replace if needed
1 Steady Flash
No network found
●
Broken/ disconnected communica on wire(s)
●
AC is installed as a legacy/ tradi onal system
●
Check communica on wires (data 1/ data 2
wires); Replace if needed
●
Check installa on type (legacy/ tradi onal 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 and R (24VAC) or
C (24VAC common)
●
Check communica on 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)
ClimateTalk
Fault Code
PCB LED
Display
Transmitted
ClimateTalk Message
Thermostat Fault
Probable Causes
Corrective Actions
11
E11
RUN SYS TEST
This test is required at startup. Installer should
navigate to the ComforrtNet User Menu, choose Air
Conditioner, then EQUIP TEST and SYSYTEM
TEST. Selecting ON will run the required test.
Display will clear once testing is complete.
●
Incomplete SYSTEM TEST
●
SYSTEM TEST is running
MESSAGE ONLY
Items below are messages only displayed on the thermostat screen.
