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
105
Service Soon
/Service
Urgent
Communication
Problem
Step 3 Troubleshooting:
New low voltage wiring will need to be ran to the system components. There are 2 options for replacing low
voltage wiring:
• OPTION 2 - Utilizing 18/2 AWG for wires going to 24VAC (R and C) terminals and 18 or 22/2 AWG shielded
wires going communicating terminals (i+ and i-).
• OPTION 3 - Utilizing two separate 18/2 AWG unshielded wires. One set wire to 24 VAC terminals (R and
C) and one set to communicating terminals (i+ and i-).
• See “Communication Wiring Options” on page 5 for Option 2 and 3 wiring diagrams.
Automatically clears
when the system
detects the issue no
longer exists.
110
Service Soon
/Service
Urgent
GF Low AC Line
Voltage
The component AC line voltage is too low. This alert code may appear during a brownout.
• It may also occur when line voltage is below its designed operating value.
• Check and correct the power line voltage.
Automatically clears
when the system
detects the issue no
longer exists.
111
Service Soon
/Service
Urgent
GF Line Polarity
Reversed
The unit is reporting that its power and neutral lines are reversed.
• Turn off the power to the system and correct the line power voltage wiring.
• System resumes normal operation ve seconds after service urgent condition is recovered.
Automatically clears
when the system
detects the issue no
longer exists.
112
Service Soon
/Service
Urgent
GF No Ground
Connection
The reporting component cannot nd earth ground. The thermostat will shut down the system.
• Provide proper earth ground to the equipment.
• System resumes normal operation ve seconds after service urgent condition is recovered.
Automatically clears
when the system
detects the issue no
longer exists.
113
Service Soon
/Service
Urgent
GF High AC Line
Voltage
Line voltage high (voltage higher than nameplate rating).
• Provide power voltage within proper range.
• System resumes normal operation ve seconds after service urgent condition is recovered.
Automatically clears
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