Lennox S40 Installation And Setup Guide

46
Alert Codes
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
10
Service
Urgent
Unknown Device
Detected
The thermostat when NOT in conguration mode has detected an unknown device. Typically the thermostat
will send a command to the unknown device and place the device into a soft disable state. The soft disable
control will indicate so as follows:
• On air handler, furnace and outdoor controls, the soft-disabled state is displayed by double horizontal lines
on seven-segment display.
• On the damper control module, the green LED will ash 3 seconds on and 1 second off.
• On the equipment interface module, the green LED will ash 3 seconds on and 1 second off.
• A new communicating device has been added to the system since the original conguration setup was
completed.
• Go to Menu > Settings > Advanced Settings > View Support Service Control Center > Equipment
Listing > Reset and select Reset All Equipment. This will allow the system to auto-detect any Lennox
communicating devices attached.
Clear alert code by
reconguring the
system.
11
Service
Urgent
Missing Device
The thermostat cannot nd a previously installed system component.
• Check all system components (devices) connections to make sure they are Lennox communicating
compatible.
• Cycle system power.
• If problem persists, then check all system components (devices) connections to make sure they are
Lennox communicating compatible.
• Go to Go to Menu > Settings > Advanced Settings > View Support Service Control Center >
Equipment Listing > Reset and select Reset All Equipment. This will allow the system to auto-detect
any Lennox communicating components attached.
Cycle system power,
and If problem
persists then clear
by reconguring the
system.
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, thermostat 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 Go to Menu > Settings > Advanced Settings > View Support Service Control Center >
Equipment Listing > Reset and select 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.

Lennox S40 Specifications

General

Brand	Lennox
Model	S40
Category	Thermostat
Language	English