Lennox iComfort S30 Installation And Setup Manual page 53

Table 1 Alert Codes and Troubleshooting
Applicable
Alert Priority
System
Code Condition
Component(s)
223 Critical Furnace
224 Critical Furnace
225 Critical Furnace
226 Critical Furnace
227 Moderate Furnace
228 Moderate Furnace
229 Minor 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 low pressure switch is open.
√ Check pressure (inches w. c.) of the low pressure switch closing during a
heat call.
Low Pressure Switch
√ Measure operating pressure (inches w. c.).
Open
√ Inspect vent and combustion air inducer for correct operation and restric­
tion.
√ Check for blocked CEHB or condensate drain and cracked hoses.
The furnace low pressure switch is stuck closed.
√ Check operation of low pressure switch to see if it is stuck closed for longer
than 150 seconds during a heat call.
Low Pressure Switch
Stuck Closed
√ Measure operating pressure (inches w. c.).
√ Inspect vent and combustion air inducer for correct operation and restric­
tion.
The furnace high pressure switch will not close.
√ Check pressure (inches w. c.) of high pressure switch closing during a heat
call.
High Press. Switch Failed
√ Measure operating pressure (inches w. c.).
to Close
√ Inspect vent and combustion air inducer for correct operation and restric­
tion.
√ Check for blocked CEHB or condensate drain and cracked hoses.
The furnace high pressure switch will not open.
√ Check operation of high pressure switch closing during a heat call.
High Pressure Switch
√ Measure operating pressure (inches w. c.).
Stuck Closed
√ Inspect vent and combustion air inducer for correct operation and restric­
tion.
The furnace low pressure switch is open while in run mode.
√ Check pressure (inches w. c.) of low pressure switch closing during a heat
call.
Lo Pressure Switch Open
√ Measure operating pressure (inches w.c.).
in Run Mode
√ Inspect vent and combustion air inducer for correct operation and restric­
tion.
√ Check for blocked CEHB or condensate drain and cracked hoses.
The furnace control is not able to calibrate the pressure switch. Unable to
perform pressure switch calibration.
Inducer/Press. Switch
√ Check vent system and pressure switch wiring connections.
Calib. Failure
√ Check the drain trap for blockage.
√ Check for blocked CEHB or condensate drain and cracked hoses.
Furnace control switched to high fire ignition because low fire pressure
Ignition on High Fire
switch did not close in allowed time.
53
How to clear alert code
Automatically clears after the is­
sue is corrected.
Automatically clears after the is­
sue is corrected.
Automatically clears after the is­
sue is corrected.
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 required.