Lennox S40 - Page 73

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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
430 26
Service
Soon/Service
Urgent
OU Inverter
Compressor Startup
Fail
Compressor start-up failure.
• If condition is detected, outdoor unit will stop (compressor and fan) – service soon condition.
• Anti-short cycle is initiated.
• If condition occurs 10 times within 60 consecutive minutes, the system will lockout – service urgent
condition.
• Inverter LEDs will ash code 26.
• Refer to the unit service documentation for detailed troubleshooting procedures.
Inverter ash code 26.
The sequence is:
• Red LED: Two Flashes
• Green LED: Six Flashes
NOTE: Inverter normal operations with no error code present is as follows. Red LED is ON and Green LED
is OFF.
• Check refrigerant
• Replace outdoor control board
• Replace inverter.
To clear, disconnect
power to outdoor unit
and restart.
431 27
Service
Soon/Service
Urgent
OU Inverter PFC Fault
The inverter has detected a PFC circuit over-current condition.
• Error occurs when PFC detects an over current condition of 100A peak.
• If condition is detected, outdoor unit will stop (compressor and fan) – service soon condition.
• Anti-short cycle timer is initiated.
• If condition occurs 10 times within 60 consecutive minutes, the system will lockout – service urgent
condition.
• Inverter LEDs will ash code 27.
• Refer to the unit service documentation for detailed troubleshooting procedures.
Inverter ash code 27.
The sequence is:
• Red LED: Two Flashes
• Green LED: Seven Flashes
NOTE: Inverter normal operations with no error code present is as follows. Red LED is ON and Green LED
is OFF.
To clear, disconnect
power to outdoor unit
and restart.