48
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
32
Information
Only-Dealer
Device Resetting
The applicable system component (device) is resetting itself. This issue may occur during a power outage or
power uctuation in the system. If persistent or if it coincides with the system operations then proceed with
the following troubleshooting steps.
• Check the power connections.
• Check the amperage draw at the transformer (possible overloaded).
• Check 24VAC voltage at the system component (device).
• If the fault persists after checking the connections, replace the applicable control.
To clear the alert code,
go to menu > settings
> advanced settings
> view dealer control
center > notications
and select the alert
code and press the
clear button.
34
Service
Urgent
Must Program Unit
Capacity For Device
The thermostat does not know the capacity (tonnage) of the indoor or outdoor unit. The applicable system
component is missing the programmed unit capacity.
• Remove power to thermostat before programming the unit control.
• Go to applicable unit control and program the unit capacity manually (see the unit installation instruction for
conguration instructions).
• Once conguration is complete then reconnect thermostat wires.
• Go to Menu > Settings > Advanced Settings > View Support Service Control Center > Equipment
Settings > Reset and select Reset HVAC 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.
35
Service
Urgent
Incorrect Operation Of
Device
• Message sent by thermostat to unit after more than 15 minutes asking for initiating heating or cooling with no response from unit.
• Message sent by thermostat to unit after more than 15 minutes asking for termination of heating or cooling with no response from
unit.
Result
A communicating device in the system has been disabled due to a fault/lockout code in the unit’s control.
Another possible cause is electrical noise interference affecting the communicating system when the compressor contactor coil is
energized.
Corrective Action:
• Single and Two-stage units only: Communicating system: Wire a transient voltage suppressor in parallel with the compressor
contactor coil terminals on the outdoor unit.
• Non-communicating outdoor unit: Wire transient voltage suppressor in parallel with compressor contactor coil or across the Y1 and
C terminals on the indoor control board.
NOTE: See service and application note IAQ-10-01 for further details.
Transient Voltage Suppressor Part information: Made by Little Fuse, part number 5KP43CA bidirectional Transorb aka TVS Diode.
36
Service
Urgent
Heating when Not
Requested
The system has been heating for at least 15 minutes without a demand for heating.
• Run the system in diagnostic mode and verify that it matches actual equipment operation. Go to 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 of heating demand.
• Recycle power.
Automatically clears
when the system
detects that the issue
no longer exists.
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