Lennox S40 - Page 64

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Table 21. Lennox S40 Smart Thermostat Alert Codes and Troubleshooting
E2A=Errors to Action, GF= Gas Furnace, AH=Air Handler, IU=Indoor unit (GF or AH), HP=Heat Pump, AC=Air Conditioner, OU=Outdoor Unit (AC or HP), PA=Pure Air S, ZA=Zone system,
SRS=Smart Room Sensor, TS=Thermostat , IAQ- IAQ Monitor and WE=Wi-Fi Extender
Alert
Code
Inverter
Flash
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
350
Service
Urgent
AH Electric Heat Not
Congured
The air handler’s electric heat is not congured or incorrectly congured.
• Heat call with no congured or incorrectly congured electric heat.
• Check for proper conguring under Conguring Electric Heat Stages in the air handler installation
instructions.
NOTE: Thermostat MUST be removed from the system before conguring electric heat.
Automatically clears
after electrical heat
detection is successful.
351
Service
Urgent
AH Electric Heat Stage
1 Fault
There is an issue with the air handler’s rst stage electric heat. Either the pilot relay contacts did not close or
the relay coil in the electric heat section did not energize.
Possible heat section / stage 1 failure.
NOTE: Air handler will operate on heat pump rst stage for the remainder of the heat call.
Automatically clears
after fault recovered.
352 Service Soon
AH Electric Heat Stage
2 Fault
There is a issue with the air handler’s second stage electric heat. Either the pilot relay contacts did not close
or the relay coil in the electric heat section did not energize.
NOTE: The air-handler will operate on rst stage electric heat until the issue is resolved.
Automatically clears
after fault recovered.
353 Service Soon
AH Electric Heat Stage
3 Fault
There is a issue with the air handler’s third stage electric heat. Either the pilot relay contacts did not close or
the relay coil in the electric heat section did not energize.
NOTE: The air-handler will operate on rst stage electric heat until the issue is resolved.
Automatically clears
after fault recovered.
354 Service Soon
Electric Heat AH
Electric Heat Stage 4
Fault
There is a issue with the air handler’s fourth stage electric heat. Either the pilot relay contacts did not close or
the relay coil in the electric heat section did not energize.
NOTE: The air-handler will operate on rst stage electric heat until the issue is resolved.
Automatically clears
after fault recovered.
355 Service Soon
AH Electric Heat Stage
5 Fault
There is an issue with the air handler’s fth stage electric heat. Either the pilot relay contacts did not close or
the relay coil in the electric heat section did not energize.
NOTE: The air-handler will operate on rst stage electric heat until the issue is resolved.
Automatically clears
after fault recovered.