Lennox icomfort Wi-Fi Setup Manual page 49

Table 5. Alert Codes and Troubleshooting
Alert
Priority Alert Text
Code
226 Critical (Furnace) The furnace high pressure switch is
stuck closed.
227 Moderate (Furnace) The furnace low pressure switch is
open in run mode.
228 Moderate (Furnace) The furnace control is not able to cali-
brate the pressure switch.
229 Minor (Furnace) The furnace control has switched to
high fire ignition because the low fire pressure
switch did not close in the allowed time.
240 Moderate (Furnace) The furnace flame current is low.
241 Critical (Furnace) The furnace flame is going out while
the furnace is heating.
250 Moderate (Furnace) The furnace primary limit switch is
open.
252 Moderate (Furnace) The furnace discharge air−tempera-
ture is high.
270 Critical (Furnace) The furnace is in Watchguard mode.
The furnace igniter cannot turn on the flame.
271 Critical (Furnace) The furnace is in Watchguard mode.
The furnace low pressure switch is open.
272 Critical (Furnace) The furnace is in Watchguard mode.
The furnace low pressure switch is open during
run mode.
273 Critical (Furnace) The furnace is in Watchguard mode.
The furnace flame is going off during a heating
cycle.
274 Critical (Furnace) The furnace limit switch has been
open for more than 3 minutes.
Critical alerts are displayed on Home (user) screen, in the Homeowner alert button, and in the Installer
alert button. Minor and Moderate alerts are found only in the Installer alert button.
Steps to clear
Check operation of high pressure switch closing during a heat call. Measure operating pressure
(inches w.c.). Inspect vent and combustion air inducer for correct operation and restriction. The
alarm/fault clears after the issue is corrected.
Check pressure (inches w.c.) of low pressure switch closing during a heat call. Measure operating
pressure (inches w.c.). Inspect vent and combustion air inducer for correct operation and restriction.
The alarm/fault clears after the issue is corrected.
Unable to perform pressure switch calibration. Check vent system and pressure
switch wiring connections. Check the drain trap for blockage. The alarm/fault clears after a success-
ful calibration.
IFC switched to high fire ignition because low fire pressure switch did not close in allowed time. No
action is needed.
Check micro−amperes of the flame sensor using thermostat diagnostics. Clean or replace the flame
sensor. Measure voltage of neutral to ground to ensure good unit ground. The alarm clears after a
proper micro−amp reading has been sensed.
Shut off gas. Check for a gas valve leak. Replace the gas valve if needed. The alarm/fault will clear
when a heat call ends successfully.
Check for proper firing rate on furnace. Ensure there is no blockage in the furnace and the ductwork.
Check for proper air flow. If limit switch is not closed within 3 minutes, the unit will go into 1−hour
Watchguard mode. The alarm/fault will clear when a heat call ends successfully.
Check temperature rise, air flow and input rate. Check for dirty filters. The alarm/fault will clear when
a heat call ends successfully.
Check for proper gas flow. Ensure that igniter is lighting burner. Check flame sensor current. Check
for dirty filters. The alarm/fault will clear on successful ignition.
Check pressure (inches w.c.) of low pressure switch closing during a heat call. Measure operating
pressure (inches w.c.). Inspect vent and combustion air inducer for correct operation and restriction.
The alarm/fault will clear on successful ignition.
Check operation of low pressure switch to see if it is stuck open during a heat call. Measure operat-
ing pressure (inches w.c.). Inspect vent and combustion air inducer for correct operation and restric-
tion. The alarm/fault will clear when a heat call ends successfully.
Check micro−amperes of flame sensor using thermostat diagnostics. Clean or replace sensor. Mea-
sure voltage of neutral to ground to ensure good unit ground. The alarm/fault will clear when a heat
call ends successfully.
The system will go into Watchguard mode. Check firing rate and air flow. Check for blockage. The
alarm/fault will clear when a heat call ends successfully.
icomfort Wi-Fit 7−Day Programmable Communicating Thermostat
Page 49
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