Lennox iComfort S30 Installation And Setup Manual page 35

Table 1. Alert Codes and Troubleshooting
Applicable
Alert Priority
System
Code Condition
Components
226 Critical Furnace
227 Moderate Furnace
228 Moderate Furnace
229 Minor Furnace
240 Moderate Furnace
241 Critical Furnace
250 Moderate Furnace and DCM
252 Moderate Furnace
Critical alerts are displayed on the Home screen, in the Homeowner alert button, and in the Installer alert button. Minor and
moderate alerts are found only in the Installer alert button.
Alert Text Component or System Operational State and Troubleshooting Tip
" Check operation of high pressure switch closing during a heat call.
The furnace high pressure
" Measure operating pressure (inches w. c.).
switch is stuck closed.
" Inspect vent and combustion air inducer for correct operation and restriction.
" Check pressure (inches w. c.) of low pressure switch closing during a heat call.
The furnace low pressure " Measure operating pressure (inches w.c.).
switch is open in run
" Inspect vent and combustion air inducer for correct operation and restriction.
mode.
" Check for blocked CEHB or condensate drain and cracked hoses.
" Unable to perform pressure switch calibration.
The furnace control is not " Check vent system and pressure switch wiring connections.
able to calibrate the pres­
" Check the drain trap for blockage.
sure switch.
" Check for blocked CEHB or condensate drain and cracked hoses.
The furnace control has
switched to high fire igni­
Furnace control switched to high fire ignition because low fire pressure switch did
tion because the low fire
not close in allowed time.
pressure switch did not
close in the allowed time.
" Check micro-amperes of the flame sensor using thermostat diagnostics.
" Clean or replace the flame sensor.
The furnace flame current
" Measure voltage of neutral to ground to ensure good unit ground.
is low.
" Clean face of burner assembly.
" Check for AC voltage from flame sensor electrode to ground.
" Shut off gas.
The furnace flame is go­ " Check for a gas valve leak.
ing out while the furnace
" Replace the gas valve if needed.
is heating.
" Check for low flame signal.
" Check for high gas pressure
" Low supply air due to plugged or restriction in system (example: dirty air filter or
The furnace primary limit
blockage in duct work)
switch is open.
" Limit trips will place the iHarmony
NOTE: If limit switch is not
closed withing three min­
" Check for proper air flow.
utes, the unit will go into a
" Check for non-functioning zone dampers.
60 minute soft lockout
(WatchGuard mode)
NOTE: Refer to S&A Note ACC-14-01 - iHarmony
Heating and Alarm Code 250 Issues for corrective actions.
" Check temperature rise, air flow and input rate.
The furnace discharge air-
temperature is high.
" Check for dirty air filter(s). .
®
zoning system into non-zone mode.
®
and SLP98 - Insufficient Zone
35
How to clear alert code
Automatically clears after the is­
sue is corrected.
Automatically clears after the is­
sue is corrected.
Automatically clears after a suc­
cessful calibration.
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.
NOTE: If this issue occurred on an
®
iHarmony zoning system, the
field will need to manually activate
the zoning.
Automatically clears when a heat
call ends successfully.