Lennox iComfort Wi-Fi Setup Manual page 52

Table 10. Alert Codes and Troubleshooting
Alert PRIORITY
Code CONDITION
273 Critical
274 Critical
275 Critical
276 Critical
290 Critical
291 Critical
292 Critical
294 Critical
507343-01
APPLICABLE
SYSTEM ALERT TEXT
COMPONENTS
The furnace flame is going off
Furnace
during a heating cycle.
The furnace limit switch has
been open for more than three
Furnace
minutes.
The furnace flame is out of se­
Furnace
quence.
The furnace is not able to cali­
brate or the high pressure
Furnace
switch opened or failed to close
in run mode.
There is a problem with the fur­
Furnace
nace ignition circuit.
The heating airflow is below the
Furnace
minimum required level.
Furnace or air The indoor unit blower motor
will not start.
handler
There is over current in the fur­
Furnace
nace inducer motor.
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 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. .
•
The system will go into
WatchGuard mode.
•
Check firing rate and air flow.
•
Check for blockage.
•
The system will go into
WatchGuard mode.
•
Shut off gas.
•
Check for gas valve leak.
•
The system will go into
WatchGuard mode.
•
Check vent system and pressure
switch wiring connections.
•
The system will go into
WatchGuard mode.
•
Measure resistance of hot sur­
face igniter.
•
Replace the hot surface igniter it
is not within specifications.
•
The system will go into
WatchGuard mode.
•
Check for dirty air filter(s) and
other air flow restrictions.
•
Check blower performance.
•
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.
•
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.
Page 52
HOW TO CLEAR
ALERT CODE
Automatically clears
when a heat call ends
successfully.
Automatically clears
when a heat call ends
successfully.
Automatically clears
on successful ignition.
Automatically clears
when the furnace cali­
brates itself success­
fully.
Automatically clears
on successful ignition
Automatically clears
when a heat call ends
successfully.
Automatically clears
after the indoor blower
motor starts success­
fully.
Automatically clears
after inducer motor
current is sensed to be
in-range after the igni­
tion following either
WatchGuard mode or
unit reset.