Lennox S40 - Page 83

83
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
548 Service Soon
ZS Humidity Sensor
Error
Without humidiers or dehumidiers, sensor reads out of range 0% to 100%. This message indicates
humidity sensor has malfunctioned.
Zone sensor will have
to be replaced or if
sensor auto corrects
itself the alert will be
automatically cleared
and system will return
to normal operations.
551 Service Soon
ZS Zone Sensor Lost
Communication
Any lost communication between any zone sensor and the damper control module will result in applicable
alert code(s) being displayed (543, 544 or 545) at the thermostat.
• A pop-up display on the thermostat will appear indicating a communication error.
• Indoor temperature for the specic zone in error will displayed as “--” on the home screen.
• When any zone sensor loses communication with the damper control module, the entire system will go into
central mode (single temperature control).
Check for loose, damage or incorrect wiring between damper control module and the zone sensor reporting
alert code 551.
Once communication
is reestablished the
zone sensor will
return to normal zone
operations.
600
Information
Only-Dealer
Load Shed Event
Compressor has been cycled OFF on utility load shedding.
• Load shedding function provides a method for a local utility company to limit the maximum power level
usage of the outdoor unit.
• The feature is activated by applying 24VAC power across the L and C terminals on the outdoor control
Automatically clears
when L terminal is
inactive.
601
Information
Only-Dealer
OU Unit Low Ambient
Operational Lockout
• Outdoor unit has been cycled off on low temperature protection.
• Outdoor unit will not operate when the outdoor ambient is at or below 4°F (-15.6°C).
• If the unit is satisfying a demand (running) and the outdoor ambient drops below 4°F (-15.6°C), the unit
will continue to operate until the demand has been satised or the outdoor ambient drops to 15°F (-9.4°C)
which will result in the unit being locked out (shut down).
Automatically clears
when low temperature
condition no longer
exists.
610
Service
Urgent
Low Room
Temperature Detected
This alert will automatically notied the user that a low room temperature condition exist. A notication is
displayed on the Thermostat and email notication sent to homeowner and dealer.
The freeze alert protection parameter range is 30°F to 50°F (-1.11 to 10.0°C). Default is 40°F (4.44°C).
NOTE: Notication is dependent on the thermostat having a active Wi-Fi connection and the user account
has been setup and includes a valid email address.
Automatically clears
when condition is
resolved.
611
Service
Urgent
High Room
Temperature Detected
This alert will automatically notied the user that a high room temperature condition exist. A notication is
displayed on the Thermostat and email notication sent to homeowner and dealer.
The heat alert protection parameter range is 80°F to 100°F (26.67 to 37.78°C). Default is 90°F (32.22°C).
NOTE: Notication is dependent on the thermostat having a active Wi-Fi connection and the user account
has been setup and includes a valid email address.
Automatically clears
when condition is
resolved.