Lennox S40 - Page 75

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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
433 29
Service
Soon/Service
Urgent
OU Inverter
Compressor Over-
current
Compressor phase current is too high.
• During initial startup, a six minute time delay is implement to prevent the alarm from occurring.
• Error occurs when compressor peak phase current is greater than 28 amps.
• Inverter will issue inverter code 14 rst and slow down to try to reduce the current.
• If the current remains high, outdoor unit will stop (compressor and fan) – service soon condition.
• Cycle timer is initiated.
• If condition occurs ve times within 60 consecutive minutes, the system will lockout – service urgent
condition.
• This alert code may be triggered by the inverter or the Lennox variable capacity outdoor (inverter
controlled) unit.
• Lennox outdoor control may trigger an this alert code if the inverter reduces the compressor speed which
is identied as a alert code 441 and the compressor speed (in hz) is below the minimum speed. This will
typically occur at start-up. The inverter automatically increases the compressor minimum speed below
45ºF in the heating mode and above 115ºF ensure the compressor capacity is sufcient for oil return.
If alert code 433 occurs and inverter does not indicate an inverter code 29, the Lennox communicating
Lennox outdoor control triggered the alert code 433.
> Check the Lennox outdoor control software version by accessing the outdoor unit diagnostics section of
the Lennox communicating thermostat. The Lennox outdoor control with software versions 1.27 and later
have updated software that includes a six minute time delay during the cooling mode and a 11 minute
delay during the heating mode after receiving an alert code 433, which typically occurs during start-up.
> If the system is connected to the Internet, the Lennox outdoor control can be updated over the Internet.
Make sure the software “auto update” is enabled. The software “auto update” can be toggled to prompt
the Lennox server to update the thermostat which will update the Lennox outdoor control. If the system is
not connected to the Internet, replace the Lennox outdoor control with catalog number 17D27 or newer
version.
• Inverter LEDs will ash code 29.
• Refer to the unit service documentation for detailed troubleshooting procedures.
Inverter ash code 29.
The sequence is:
• Red LED: Two Flashes
• Green LED: Nine Flashes
NOTE: Inverter normal operations with no error code present is as follows. Red LED is ON and Green LED
is OFF.
To clear alert code
disconnect power to
both the indoor and
outdoor units and
then reconnect power.
Restart system.