Lennox iComfort Wi-Fi Setup Manual page 57

Table 10. Alert Codes and Troubleshooting
Alert PRIORITY
Code CONDITION
406 Critical
407 Critical
408 Critical
Furnace, air han­
409 Moderate
410 Moderate
411 Critical
®
iComfort Wi-Fi
APPLICABLE
SYSTEM ALERT TEXT
COMPONENTS
The required amount of current
is not passing through the
Outdoor unit
START current transformer.
The required amount of current
is not passing through RUN
Outdoor unit
current transformer.
The compressor is running
Outdoor unit
continuously.
The secondary voltage for the
applicable system component
dler or outdoor
has fallen below 18VAC.
unit
Unit low pressure is below the
Outdoor unit
required limit.
The low-pressure switch has
opened five times during a sin­
Outdoor unit
gle demand.
Critical alerts are displayed on the Home screen, in the Home­
owner alert button, and in the Installer alert button. Minor and
moderate alerts are found only in the Installer alert button.
COMPONENT OR SYSTEM OPERA­
TIONAL STATE AND TROU­
BLESHOOTING TIP
•
The start current sensors look for
the presence of a minimum of
three amps current (for up to 15
seconds) on the run and start
windings of the compressor while
there is a Y1 signal. If no current
is sensed with the Y1 signal still
present, the control will cycle the
Y1 demand, which will cycle com­
pressor OFF.
•
Check wiring at outdoor control
and compressor amperage.
•
NOTE: This alert code is applica­
ble only to first-generation out­
door unit that had current sen­
sors.
•
The start current sensors look for
the presence of a minimum of
three amps current (for up to 15
seconds) on the run and start
windings of the compressor while
there is a Y1 signal. If no current
is sensed with the Y1 signal still
present, the control will cycle the
Y1 demand, which will cycle com­
pressor OFF.
•
Check wiring at outdoor control
and compressor amperage.
•
NOTE: This alert code is applica­
ble only to first-generation out­
door unit that had current sen­
sors.
•
Welded contacts
•
Replace compressor contactor.
•
Confirm 24VAC power to contact­
or.
•
Verify all wiring connections are
tight to contactor terminals.
•
Secondary voltage is below
18VAC.
•
If this continues for 10 minutes,
the thermostat will turn off the ap­
plicable system component.
•
Check operating pressures.
•
Low pressure switch opens at 40
psig (system shuts down) and
closes at 90 psig (system
restarts).
•
Thermostat will shut down the
outdoor unit.
•
Open low pressure switch error
count reached five strikes.
•
Check system charge using ap­
proach and sub cooling tempera­
tures.
•
Reset by putting outdoor unit con­
trol in test mode or resetting low
voltage power.
7-Day Programmable Communicating Thermostat
Page 57
HOW TO CLEAR
ALERT CODE
Automatically clears
after current is sensed
in START sensor, or
after power reset.
Automatically clears
after current is sensed
in RUN sensor, one
normal compressor
run cycle, or after pow­
er reset
Automatically clears
after one normal com­
pressor run cycle or
after power reset.
Automatically clears
after voltage is detect­
ed as higher than
20VAC for two sec­
onds or after power re­
set.
Automatically clears
when the system de­
tects that the issue no
longer exists.
Automatically clears
when the system de­
tects that the issue no
longer exists.