Lennox S40 Installation And Setup Guide

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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
37
Service
Urgent
Cooling when not
Requested
The system has been cooling for at least 15 minutes, without a demand for cooling.
• Run the system in diagnostic mode and verify that it matches actual equipment operation. Go to Menu >
Settings > Advanced Settings > View Support Service Control Center and select Diagnostics and
press the start diagnostics button.
• Check for other alert codes that may be preventing the system from operating as expected.
• Check all cooling equipment to determine cause of cooling demand.
• Recycle power.
Automatically clears
when the system
detects that the issue
no longer exists.
38
Service
Urgent
Not Heating when
Requested
The system has not been able to turn on the heating for more than 45 minutes.
• The system will go off-line for 60 minutes and will attempt to restart itself.
• Run the system in diagnostic mode and verify that it matches actual equipment operation. Go to Menu >
Settings > Advanced Settings > View Support Service Control Center and select Diagnostics and
press the start diagnostics button.
• Check for other alert codes that may be preventing the system from operating as expected.
• Check all heating equipment to determine cause.
• Recycle power.
Automatically clears
when the system
detects that the issue
no longer exists.
39
Service
Urgent
No Cooling when
Requested
The system has not been able to turn on the cooling for more than 45 minutes.
• The system will go off-line for 60 minutes and will attempt to restart itself.
• Run the system in diagnostic mode and verify that it matches actual equipment operation. Go to Menu >
Settings > Advanced Settings > C and select Diagnostics and press the start diagnostics button.
• Check for other alert codes that may be preventing the system from operating as expected.
• Check all cooling equipment to determine cause.
• Recycle power.
This alert code will
automatically clear
when the system
detects the issue no
longer exists.

Lennox S40 Specifications

General

Display	Color touchscreen
Voice Control	Amazon Alexa, Google Assistant
Energy Reports	Yes
Programming	7-day programmable
Warranty	5-year limited warranty
Connectivity	Wi-Fi
Compatibility	Lennox HVAC systems
Smart Features	Geofencing
Sensors	Temperature, Humidity