Lennox S40 - Page 78

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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
437 65
Service
Soon/Service
Urgent
OU Inverter Heat-Sink
temp Sensor Fault
Heat sink temperature sensor fault has occurred (temperature less than 4ºF or greater than 264ºF after 10
minutes of operation).
• When the temperature sensor detects a temperature less than 4ºF or greater than 264ºF after 10 minutes
of operation.
• Outdoor unit will stop both compressor and fan – service soon condition.
• Anti-short cycle is initiated.
• If condition occurs ve times within an hour, system will lockout – service urgent condition.
• Inverter LEDs will ash code 65.
• Refer to the unit service documentation for detailed troubleshooting procedures.
Inverter ash code 65.
The sequence is:
• Red LED: Six Flashes
• Green LED: Five Flashes
NOTE: Inverter normal operations with no error code present is as follows. Red LED is ON and Green LED
is OFF.
Service soon
priority condition will
automatically clear
when the inverter
sends an alert code
clear message.
Service urgent
priority condition
can be cleared by
disconnecting and
reconnecting power to
outdoor unit to restart.
438 73
Service
Soon/Service
Urgent
OU Inverter PFC Input
Overcurrent
The inverter has detected a power factor correction (PFC) circuit over-current condition.
• The inverter has detected an PFC over current condition. This may be caused by a high load condition,
high pressure, or outdoor fan failure.
• Outdoor control will display the code when the inverter has detected the error – service soon condition.
• After three minutes, the inverter will reset and the compressor will resume operation.
• If the error condition occurs 10 times within a 60 minute rolling time period, the outdoor unit control will lock
out operation of the outdoor unit – service urgent condition.
• Possible issue is system running at high pressures.
• Check for high pressure trips or other alert codes in thermostat and outdoor control.
• Inverter LEDs will ash code 73.
• Refer to the unit service documentation for detailed troubleshooting procedures.
Inverter ash code 73.
The sequence is:
• Red LED: Seven Flashes
• Green LED: Three Flashes
NOTE: Inverter normal operations with no error code present is as follows. Red LED is ON and Green LED
is OFF.
Service soon
priority condition
is automatically
cleared when the
inverter sends a clear
message.
Service urgent
priority condition will
automatically clear
when inverter is power
cycled.