Lennox iComfort Wi-Fi Setup Manual page 51

Table 10. Alert Codes and Troubleshooting
Alert PRIORITY
Code CONDITION
229 Minor
240 Moderate
241 Critical
250 Moderate
252 Moderate
270 Critical
271 Critical
272 Critical
®
iComfort Wi-Fi
APPLICABLE
SYSTEM ALERT TEXT
COMPONENTS
The furnace control has
switched to high fire ignition be­
cause the low fire pressure
Furnace
switch did not close in the al­
lowed time.
The furnace flame current is
Furnace
low.
The furnace flame is going out
Furnace
while the furnace is heating.
The furnace primary limit switch
Furnace
is open.
The furnace discharge air-tem­
Furnace
perature is high.
The furnace is in WatchGuard
mode. The furnace igniter can­
Furnace
not turn on the flame.
The furnace is in WatchGuard
mode. The furnace low pres­
Furnace
sure switch is open.
The furnace low pressure
switch is open during run
Furnace
mode.
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
Furnace control switched to high fire
ignition because low fire pressure
switch did not close in allowed time.
•
Check micro-amperes of the
flame sensor using thermostat di­
agnostics.
•
Clean or replace the flame sen­
sor.
•
Measure voltage of neutral to
ground to ensure good unit
ground.
•
Shut off gas.
•
Check for a gas valve leak.
•
Replace the gas valve if needed.
•
Check for proper firing rate on fur­
nace.
•
Ensure there is no blockage in
the furnace and the duct work.
•
Check for proper air flow.
•
If limit switch is not closed within
three minutes, the unit will go into
one hour WatchGuard mode.
•
Check temperature rise, air flow
and input rate.
•
Check for dirty air filter(s). .
•
This is a five strike condition dur­
ing a single demand.
•
Check for proper gas flow.
•
Ensure that igniter is lighting
burner.
•
Check flame sensor current.
•
Check for dirty filters.
•
This is a five strike condition dur­
ing a single demand.
•
Check pressure (inches w. c.) of
low pressure switch closing dur­
ing a heat call.
•
Measure operating pressure
(inches w. c.).
•
Inspect vent and combustion air
inducer for correct operation and
restriction.
•
The system will go into
WatchGuard mode.
•
Check operation of low pressure
switch to see if it is stuck open
during a heat call.
•
Measure operating pressure
(inches w. c.).
•
Inspect vent and combustion air
inducer for correct operation and
restriction.
7-Day Programmable Communicating Thermostat
Page 51
HOW TO CLEAR
ALERT CODE
No action is needed.
Automatically clears
after a proper micro-
amp reading has been
sensed.
Automatically clears
when a heat call ends
successfully.
Automatically clears
when a heat call ends
successfully.
Automatically clears
when a heat call ends
successfully.
Automatically clears
on successful ignition.
Automatically clears
on successful ignition.
Automatically clears
when a heat call ends
successfully.