83
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).
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 switches Data
1 and Data 2. Reset Power and check for .6 DCV.
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
●
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)
