Lennox S40 - Page 82

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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
532
Information
Only-Dealer
ZS Zoning Pressure
Switch Opened (High
Pressure)
Zoning Pressure Switch Opened (high pressure).
• Compressor pressure is above the specied limit.
• Compressor is turned off.
• Zoning will be restored once the high pressure switch closes.
Occasionally we get this with an air conditioner systems and the x is to just jump out the pressure switch
terminals on the damper control module board.
Automatically clears
after compressor
pressure is within
limits.
542 Service Soon
ZS Zone 1 Temp
Sensor Fault
Possible Causes:
• Zone temperature sensor reading out of range.
• Check for loose or incorrectly wired connections at the zone sensor or damper control module terminals.
• Open or short zone temperature sensor detected for more than ve second.
• More than one zone sensor has the same assigned zone number. Check zone sensor(s) zone number
assignment.
System Response:
• Both types of zone sensors will display “--” as the indoor temperature on the main screen.
• Damper control module will operate in central mode (all dampers open).
• At the Lennox communicating thermostat, only zone 1 screen will be available.
NOTE: The Lennox communicating thermostat will display the alert code as “Problem (Zoning Control)”.
Email notications will describe the issue as “ Zone “X” Temp Sensor Problem.
Automatically clears 30
seconds after condition
no longer exist.
543 Service Soon
ZS Zone 2 Temp
Sensor Fault
544 Service Soon
ZS Zone 3 Temp
Sensor Fault
545 Service Soon
ZS Zone 4 Temp
Sensor Fault
546 Service Soon
ZS Parameters
resetting from restored
power
An EEPROM is a memory device that stores and remembers the information even after power has been
removed from the device. It saves settings that the user might have selected like to desired heating and
cooling temperatures. When power is removed and then comes back on, the zone sensors (or thermostat
for zone 1) remembers what the users setting were. Code 546 is given if the zone sensor notices that the
EEPROM has an issue right after power is rst applied. The system will set itself to energy save mode and
continue to operation
Zone sensor will have
to be replaced.
547 Service Soon
ZS Parameters
resetting from system
interruption
An EEPROM is a memory device that stores and remembers the information even after power has been
removed from the device. It saves settings that the user might have selected like to desired heating and
cooling temperatures. When power is removed and then comes back on, the zone sensor remembers
what the users setting were. Code 547 is given if the zone sensor notices that the EEPROM has an issue
sometime later after the product has been on for a while. It will not raise the issue until it needs to again
read from the EEPROM memory when it is rst powering to retrieve the necessary information. System will
operate in a normal mode operator until power off.
Zone sensor will have
to be replaced.