Lennox icomfort Wi-Fi - Page 52

507343-01
Page 52
Table 10. Alert Codes and Troubleshooting
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.
Alert
Code
PRIORITY
CONDITION
APPLICABLE
SYSTEM
COMPONENTS
ALERT TEXT
COMPONENT OR SYSTEM OPERA
TIONAL STATE AND TROU
BLESHOOTING TIP
HOW TO CLEAR
ALERT CODE
273 Critical
Furnace
The furnace flame is going off
during a heating cycle.
 The system will go into
WatchGuard mode.
 Check micro-amperes of flame
sensor using thermostat diagnos
tics.
 Clean or replace sensor.
 Measure voltage of neutral to
ground to ensure good unit
ground. .
Automatically clears
when a heat call ends
successfully.
274 Critical
Furnace
The furnace limit switch has
been open for more than three
minutes.
 The system will go into
WatchGuard mode.
 Check firing rate and air flow.
 Check for blockage.
Automatically clears
when a heat call ends
successfully.
275 Critical
Furnace
The furnace flame is out of se
quence.
 The system will go into
WatchGuard mode.
 Shut off gas.
 Check for gas valve leak.
Automatically clears
on successful ignition.
276 Critical
Furnace
The furnace is not able to cali
brate or the high pressure
switch opened or failed to close
in run mode.
 The system will go into
WatchGuard mode.
 Check vent system and pressure
switch wiring connections.
Automatically clears
when the furnace cali
brates itself success
fully.
290 Critical
Furnace
There is a problem with the fur
nace ignition circuit.
 The system will go into
WatchGuard mode.
 Measure resistance of hot sur
face igniter.
 Replace the hot surface igniter it
is not within specifications.
Automatically clears
on successful ignition
291 Critical
Furnace
The heating airflow is below the
minimum required level.
 The system will go into
WatchGuard mode.
 Check for dirty air filter(s) and
other air flow restrictions.
 Check blower performance.
Automatically clears
when a heat call ends
successfully.
292 Critical
Furnace or air
handler
The indoor unit blower motor
will not start.
 The system will go into
WatchGuard mode.
 Indoor blower motor unable to
start.
 This could be due to seized bear
ing, stuck wheel, and obstruc
tions.
 Replace motor or wheel if assem
bly does not operate or meet per
formance standards.
Automatically clears
after the indoor blower
motor starts success
fully.
294 Critical
Furnace
There is over current in the fur
nace inducer motor.
 The system will go into
WatchGuard mode.
 Check combustion blower bear
ings, wiring and amps.
 Replace furnace inducer motor if
it does not operate or does not
meet performance standards.
Automatically clears
after inducer motor
current is sensed to be
in-range after the igni
tion following either
WatchGuard mode or
unit reset.