Lennox iComfort S30 Installation And Setup Manual page 58

Initial notification of critical alerts will pop up on the home screen and will be listed under notification menu. Minor and moderate alerts are found only under the notification menu.
* Current Lennox modulating outdoor units are XC20, XP20, XC25 and XP25.
Applicable
Alert Priority
System
Code Condition
Component(s)
241 Critical Furnace
Furnace and
250 Moderate
iHarmony
252 Moderate Furnace
270 Critical Furnace
271 Critical Furnace
272 Critical Furnace
Table 18. Alert Codes and Troubleshooting
Actual
Displayed Alert Component or System Operational State and Troubleshooting Tip
Text
The furnace flame is going out while the furnace is heating.
• Shut off gas.
Flame Out of
Sequence - Still
• Check for a gas valve leak.
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 within three minutes, the unit will go into a 60 minute soft lockout
(WatchGuard mode).
• Check for high gas pressure.
• Low supply air due to being plugged or restriction in system (example: dirty air filter or blockage
Primary Limit
in duct work).
Switch Open
• Limit trips will place the iHarmony zoning system into non-zone mode.
• Check for proper firing rate on furnace.
• Check for non-functioning zone dampers.
NOTE: Refer to S&A Note ACC-14-01 - iHarmony and SLP98 - Insufficient Zone Heating and
Alarm Code 250 Issues for corrective actions.
The furnace discharge air-temperature is high.
Discharge Air
Temperature • Check temperature rise, air flow and input rate.
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 -
• Ensure that igniter is lighting burner.
Flame Failure
on Ignite
• Check flame sensor current.
• Check for dirty filters.
• Check for blocked cold end heater box 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.
WatchGuard
• Check pressure (inches w. c.) of low pressure switch closing during a heat call.
- Low Press
Switch Open
• Measure operating pressure (inches w. c.).
• Inspect vent and combustion air inducer for correct operation and restriction.
The furnace low pressure switch is open during run mode. The system will go into WatchGuard
mode.
WatchGuard -
• Check operation of low pressure switch to see if it is stuck open during a heat call.
Lo Press Switch
Open Run • Measure operating pressure (inches w. c.).
Mode
• Inspect vent and combustion air inducer for correct operation and restriction.
• Check for blocked cold end heater box or condensate drain and cracked hoses.
58
How to clear alert code
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 success-
ful ignition.
Automatically clears on success-
ful ignition.
Automatically clears when a heat
call ends successfully.