53
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 > Notications
Component or System Operational State and Troubleshooting Tip
How to clear
alert code
114
Service
Soon/Service
Urgent
AC Line Frequency /
Distortion Prob
In most cases the errors will have something to do with the transformer(s) phasing, input power or output loading (amperage load).
For the air handler control only, alert code 114 is generated only if the measured line frequency is below 57Hz or above 63Hz and
remains out of range for 10 consecutive seconds. We count power line cycles and determine line frequency every 1 second of time
based on the processor’s quartz crystal oscillator. We have a fair amount of ltering on when we consider a power line cycle to have
occurred, so there would have to be really bad distortion for it to count an extra cycle or miss a real cycle.
Voltage low enough to miss a cycle would generate an alert code 115. There are lots of events, such as power utility substation
switching, that could occasionally make our power line frequency off by one count. These are rare one-time events and I don’t know
anything other than a generator with bad frequency that could cause problems long enough to cause this alert code.
There is a frequency / distortion problem with the power to a specic system component. This alert code may indicate transformer
overloading.
• Check the voltage and line power frequency.
• Check the generator operating frequency, if the system is running on back-up power.
• Correct voltage and frequency problems.
• System will resume normal operation ve seconds after fault recovered.
• All applicable system component outputs are disabled – service soon condition.
• After 10 minutes, the priority condition is escalated – service urgent condition.
• Damper control module will operate in central mode only until proper voltage is restored or frequency distortion is resolved
• If connected to Lennox Smart Zoning system, set damper control module transformer jumper to system transformer. Check for
proper wiring. Replace 40VAC furnace transformer with 70VAC transformer. Re-commission system.
NOTE: The unitary control (outdoor unit control board) whether it is a single, two-stage or multi-stage control is not displaying alert
code 114.
115
Service
Urgent
Low Secondary
(24VAC) Voltage
24VAC power to a system component control is lower than the required range of 18 to 30VAC.
• Check and correct voltage.
• Check for additional power-robbing system components (devices) connected to system.
• This alert code may require the installation of an additional or larger VA transformer.
• Damper control module will operate in non-zone mode until proper voltage is restored.
Automatically clears
when the system
detects the issue no
longer exists.
116 Service Soon
IU High Secondary
(24VAC) Voltage
• Thermostat will display this code when 24VAC power is high (18 to 30VAC).
• Will display Furnace or Air Handler High Secondary (24VAC) voltage.
Check and correct
voltage. Check for
proper line voltage
(120VAC, 240VAC,
etc.) to equipment.
Clears when control
senses proper voltage.
117 Service Soon IU Poor Ground
The reporting unit has poor earth grounding.
• Provide proper grounding for the system component (device).
• Check for proper earth ground to the system.
• Reference Corp0123L10 for additional information
Automatically clears 30
seconds after the issue
is corrected.
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