50
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
40
Information
Only-Dealer
HP Heating Lockout.
The heat pump could not increase the room temperature 0.5°F towards the set point in 30 minutes.
Gas Furnace Heating
In order to use the gas furnace as a primary heating source (not defrost tempering) when the outdoor temperature is between the high
and low balance points, the heat pump:
• Must be used for a minimum of 30 minutes and the temperature in the zone not increase by more than 0.5°F
• Has not gone into defrost in the 30 minute period.
The default for HP Heating Lockout Time default is 120 minutes and will lock the heat pump off when the outdoor temperature is above
the high balance point. Selectable range is 60 to 240 minutes.
• Go to Menu > Settings > Advanced Settings > Menu > Settings > Advanced Settings > View Support Service Control Center
and select Equipment Listing > Thermostat and located HP Heating Lockout Time to verify the lockout time setting.
• Check air ow to the zones or zones.
• Check discharge air temperatures.
• Check calibration of room thermostat.
Outdoor Unit and Zoning
When the heat pump could not get a zone thermostat to progress 0.5°F towards the set point in 30 minutes the system will lock out
the heat pump and switch to the secondary heat source. (Electric heat or if in dual fuel applications the furnace will be used and the
system put in heat pump heating lockout timer) default is 120 minutes. It will lock the heat pump off and the gas furnace will nish the
heating cycle
Set the low balance point and high balance point as close together as possible. (This is a 3°F difference – Example: set high balance
point at 25°F and low balance point would set at 22°F). Below the low balance point, the furnace will heat the home / between the
low and high balance point, the heat pump and furnace will heat the home. I when the outdoor temperature is above the high balance
point, the gas furnace is locked out and all the heat is provided by the heat pump.
41
Information
Only-Dealer
Device Control Board
Replaced
This alert code will appear anytime a communicating control [Furnace, air handler, PureAir S, damper control
module, air conditioner or heat pump] is replaced in the system.
Must be cleared
manually.
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