Troubleshooting; Interpreting The Diagnostic Leds; Cooling; Heating - Nordyne R-410A Installation Instructions Manual

TRIP LED (Red): indicates there is a demand
signal from the thermostat but no current to the
compressor is detected by the module. The TRIP
LED typically indicates the compressor protector
is open or may indicate missing supply power
to the compressor.
The scroll compressor's run (R), common (C)
and start (S) wires are routed through the holes
TM
in the Comfort Alert module marked "R," "C"
and "S."
24 VAC Power Wiring — The Comfort Alert
module requires a constant nominal 24 VAC
power supply. The wiring to the module's R and
C terminals must be directly from the indoor unit
or thermostat.
TM
The Comfort Alert module requires a thermostat
demand signal to operate properly.
NOTE: After the thermostat demand signal is
connected, verify that 24 VAC across Y and C
when demand is present.

TROUBLESHOOTING

Interpreting The Diagnostic LEDs – When
an abnormal system condition occurs, the
Comfort Alert TM module displays the appropriate
ALERT and/or TRIP LED will fl ash a number of
times consecutively, pause and then repeat the
process. To identify a Flash Code number, count
the number of consecutive fl ashes.
Every time the module powers up, the last
ALERT Flash Code that occurred prior to shut
down is displayed for one minute. The module
will continue to display the LED until the condition
returns to normal or if 24 VAC power is removed
from the module.
Cooling — Gradually lower the thermostat
temperature setpoint below the actual room
TM
temperature and observe that the outdoor unit
and indoor blower energize. Feel the air being
circulated by the indoor blower and verify that
it is cooler than ambient temperature. Listen
for any unusual noises. If present, locate and
determine the source of the noise and correct
as necessary.
Heating — Lower the thermostat setpoint
temperature to the lowest obtainable setting and
set the thermostat function switch to HEATING.
The indoor blower and outdoor unit should stop
running. After a minimum of fi ve minutes, increase
the setpoint temperature of the thermostat to the
maximum setting. Verify that the outdoor unit and
indoor blower have energized. Feel the air being
circulated by the indoor blower and verify that
it is warmer than ambient temperature. Listen
POWER
ALERT
TRIP
Figure 2. Comfort Alert
Module
TM
Diagnostics
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