Lennox EIM - Alert Codes and Troubleshooting

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Table 1. Alert Codes and Troubleshooting
GF= Gas Furnace, AH=Air Handler, ID=Indoor unit (GF or AH), HP=Heat Pump, AC=Air Conditioner, OD=Outdoor Unit (AC or HP), PA=Pure Air S, ZA=Zone system and
TS=Thermostat
Alert
Code
Priority
Condition
Actual Displayed
Alert Text
Under dealer
control center >
Notications
Component or System Operational State and Troubleshooting Tip
How to clear
alert code
12
Service
Urgent
Indoor Unit Not
Detected
Thermostat did not nd an indoor unit. Make sure there is an Lennox communicating indoor unit on the system.
Check for voltage and missing component.
Check R, i+, i- and C connections at mag-mount or subbase, smart hub and all attached communicating
components.
Ohm wires for electrical continuity.
Cycle power to both indoor unit rst and then thermostat.
Verify that equipment interface module (if applicable) is congured as either an air handler or furnace when used
with a non-communicating indoor unit.
Go to menu > settings > advanced settings > view dealer control center > equipment and press reset all
equipment. This will allow the system to auto-detect any Lennox communicating components attached.
Replace indoor unit control if there is no response.
Automatically clears when
the system detects that the
issue no longer exists.