Lennox iComfort S30 Installation And Setup Manual page 54

Table 1 Alert Codes and Troubleshooting
Applicable
Alert Priority
System
Code Condition
Component(s)
240 Moderate Furnace
241 Critical Furnace
Furnace and
250 Moderate
iHarmony
252 Moderate Furnace
270 Critical Furnace
271 Critical 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.
Actual Displayed Alert
Component or System Operational State and Troubleshooting Tip
Text
The furnace flame current is low.
√ Check micro-amperes of the flame sensor using thermostat diagnostics.
√ Clean or replace the flame sensor.
Low Flame Current - Run
Mode
√ Measure voltage of neutral to ground to ensure good unit ground.
√ Clean face of burner assembly.
√ Check for AC voltage from flame sensor electrode to ground.
The furnace flame is going out while the furnace is heating.
√ Shut off gas.
Flame Out of Sequence -
√ Check for a gas valve leak.
Still Present
√ Replace the gas valve if needed.
√ Check for low flame signal.
The furnace primary limit switch is open.
√ If limit switch is not closed withing three minutes, the unit will go into a 60
minute soft lockout (WatchGuard mode).
√ Check for high gas pressure.
√ Low supply air due to plugged or restriction in system (example: dirty air
Primary Limit Switch
filter or blockage in duct work).
Open
√ Limit trips will place the iHarmony
√ Check for proper firing rate on furnace.
√ Check for non-functioning zone dampers.
NOTE: Refer to S&A Note ACC-14-01 - iHarmony
Zone Heating and Alarm Code 250 Issues for corrective actions.
The furnace discharge air-temperature is high.
Discharge Air
√ Check temperature rise, air flow and input rate.
Temperature High
√ Check for dirty air filter(s).
The furnace is in WatchGuard mode. The furnace igniter cannot turn on the
flame. This is a five strike condition during a single demand.
√ Check for proper gas flow.
WatchGuard - Flame
√ Ensure that igniter is lighting burner.
Failure on Ignite
√ Check flame sensor current.
√ Check for dirty filters.
√ Check for blocked CEHB or condensate drain and cracked hoses.
The furnace is in WatchGuard mode. The furnace low pressure switch is
open. This is a five strike condition during a single demand.
√ Check pressure (inches w. c.) of low pressure switch closing during a heat
WatchGuard - Low Press
call.
Switch Open
√ Measure operating pressure (inches w. c.).
√ Inspect vent and combustion air inducer for correct operation and restric­
tion.
®
zoning system into non-zone mode.
®
and SLP98 - Insufficient
54
How to clear alert code
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.
Automatically clears on successful
ignition.
Automatically clears on successful
ignition.