Amana AVZC18 Installation & Service Reference page 34

T
ROUBLESHOOTING
N T
ETWORK 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.
OFF ON
1
2
LED COLOR
Red Communications LED
(H1P)
Green Receive LED 1 Steady Flash
(H2P)
Rapid Flashing
TERM
LED Status Indication
Off Nominal condition
1 Flash Communications Failure
2 Flash Out-of-box reset
No power
Off
Communications error
No network found
Nominal network traffic
On Solid Data 1/Data 2 miss-wire
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.
Probable Causes
● None
● Unknown packet is received
● Control power up
● Learn bu on depressed
● No power to Outdoor unit
● Open fuse
● Communica on error
● Broken/ disconnected communica on
wire(s)
● AC is installed as a legacy/ tradi onal
system
● Control is "talking" on network as expected ● none
● 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
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Corrective Actions
● none
● Depress learn bu on
● None
● 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
● 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
● Check communica on wires (data 1/ data 2 wires);
Replace if needed
● Check data 1/ data 2 voltages