Lennox S40 - Page 62

62
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
295 Service Soon
ID Blower Over
Temperature
The indoor blower motor is overheating. Indoor blower motor over temperature (motor tripped on internal
protector).
• Check motor bearings and amps.
• Replace indoor blower motor if necessary.
• Check for high duct static.
Automatically clears
after blower demand is
satised.
310 Service Soon
Discharge Air Temp
Sensor Error
There is a discharge air temperature sensor issue.
• Conrm there is no short or open circuits in the Lennox communicating thermostat connections to any of
the other components in the communicating system.
• Compare discharge air temperature sensor (DATS) resistance to temperature / resistance charts in system
component installation instruction.
• Replace discharge air sensor if necessary.
NOTE: Issues with a DATS connected to a damper control module or equipment interface model will not
generate an alert code.
Automatically clears
30 seconds after
condition is detected
as recovered or after
system restart.
311
Information
Only-Dealer
GF Heat Rate Reduced
To Match Airow
The heat ring rate has been reduced to match available airow (cutback mode). This is a alert code.
Furnace blower in cutback mode due to restricted airow.
• Reduce ring rate every 60 seconds to match available CFM.
• Check air lter and duct system.
• To clear, replace air lter if needed or repair or add additional ducting.
Two-stage controls will reduce ring rate to rst stage.
Automatically clears
when a heating call
nishes successfully.
312
Information
Only-Dealer
Reduced/Airow-Indoor
Blower Cutback
The indoor blower cannot provide the requested CFM due to excessive static pressure. This is a minor alert
code.
• Static pressure has exceeded the capability of the blower motor.
• Possible restricted airow - Indoor blower is running at a reduced CFM (cutback mode).
• The variable speed motor has pre-set speed and torque limiters to protect the motor from damage caused
by operating outside of design parameters (0 to 0.8” e.g. total external static pressure).
• Check air lter and duct system.
• To clear, replace air lter if needed or repair or add additional ducting.
NOTE: Blower motor cutbacks will not show alarm code. Duct static pressure reading must be taken.
Automatically clears
when a heating call
nishes successfully.
344
Service
Urgent
GF IFC Relay Y1 Stuck
Link Relay Problem. Issue could be with possible Y1 relay failure.
NOTE: Relay is located on the IFC (Integrated Furnace Control). If issue continues replace IFC.
Automatically clears
ve minutes after Y1
input sensed OFF.