47
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 > Notications
Component or System Operational State and Troubleshooting Tip
How to clear
alert code
13
Service
Urgent
Duplicate Comfort
Sensor ID
Thermostat found more than one outdoor unit, or more than one indoor unit, or more than one thermostat
connected to the system. Thermostat will display the message “Too Many Devices of the Same Type”.
• Check wiring and remove duplicate equipment.
• 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.
Automatically clears
when the system
detects that the issue
no longer exists.
14
Service
Urgent
Too Many Devices of
the Same Type
The thermostat found more than one thermostat, indoor or outdoor unit on the system.
• Check wiring and remove duplicate equipment.
• 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.
Automatically clears
when the system
detects that the issue
no longer exists.
15
Information
Dealer Only
Parameter Mismatch
Detected
Incorrect parameter settings detected. Dealer would need to re-set the system and start conguration again.
Automatically clears
once proper system
conguration is
completed.
20
Service
Urgent
Protocol Upgrade
Required
The thermostat cannot work with one of the system devices because the thermostat rmware needs to be
updated rst
Update thermostat
rmware.
21
Service
Urgent
Incompatible
Equipment Detected
Equipment is trying to be utilized that is not compatible with other system components, such as a single-stage
non-variable speed motor furnace with a variable capacity outdoor unit.
Use compatible
equipment.
29
Service
Urgent
Over Temperature
Protection
The thermostat is reading an indoor temperature that is higher than 90ºF (factory default). The thermostat
will not allow any heating operation to begin until it senses an indoor temperature lower than 90ºF. Indoor
temperature rose above 90ºF during a heating or cooling demand.
• Heating operation is not allowed.
• Check to ensure that heating equipment is not stuck ON (reversing valve, etc.)
• Check the accuracy of the thermostat temperature sensor.
• Select cooling system mode to cool the indoor space below 90ºF.
Automatically clears
when the system
detects that the issue
no longer exists.
30
Service
Urgent
Low Temperature
Protection
The thermostat will not allow any cooling operation to begin until it senses a temperature higher than 40ºF.
• Cooling operation is not allowed.
• Check to ensure that cooling equipment is not stuck ON.
• Check accuracy of the thermostat temperature sensor.
• Select heating system mode to heat the indoor space to above 40ºF.
Automatically clears
when the system
detects that the issue
no longer exists.
31
Service
Urgent
Lost communication
with Device
The applicable system component (indoor, equipment interface, damper control module or outdoor unit) has
not communicated with thermostat for more than three minutes.
• Check connections and voltages.
• Ohm wires for electrical continuity.
• If oat switch is installed on air handler drain pain, check condensate line to ensure it is not clogged and
tripping the oat switch connected in series with R terminal.
• Check to see if freezestat is installed.
If fault persists, then
cycle power.
Fault clears after
communication is
restored.
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