Lennox S40 - Page 89

89
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
71510
Service
Soon
OU: ID TXV Failure
• Super Heat average is not in expected range. (Too high or too low superheat)
• Replace Expansion Valve.
Automatically clears
when the system
detects that the issue
no longer exists.
71511
Service
Soon
IU: Duct or Filter
Blockage
Clean ducts or replace lter.
Automatically clears
when the system
detects that the issue
no longer exists.
71512
Service
Urgent
OU: High-Pressure
Switch Fault
• If switch tripped without meeting the liquid pressure condition.
• If Liquid pressure > 500 psig then replace high-pressure switch.
Automatically clears
when the system
detects that the issue
no longer exists.
71513
Service
Soon
OU: Low-Pressure
Switch Fault
• If switch tripped without meeting the suction pressure condition.
• Replace low-pressure switch.
Automatically clears
when the system
detects that the issue
no longer exists.
71514
Service
Soon
OU: System Low on
Refrigerant Charge
• If sub cooling average is not within expected range for given ODT and compressor Hz.
• Add refrigerant
Automatically clears
when the system
detects that the issue
no longer exists.
71515
Service
Urgent
HP: Reversing Valve
Stuck
• If liquid and suction pressure average ratio does not fall within the expected range.
• Service reversing valve message.
Automatically clears
when the system
detects that the issue
no longer exists.
71516
Service
Urgent
OU: Outdoor Fan
Motor Failure
• If superheat suction pressure values are not within expected range.
• Service outdoor fan.
Automatically clears
when the system
detects that the issue
no longer exists.
71517
Service
Urgent
IU: Indoor Fan Motor
Failure
• If superheat suction pressure values are not within expected range.
• Service indoor fan.
Automatically clears
when the system
detects that the issue
no longer exists.
71518
Service
Urgent
OU: Compressor
Failed to Start
• If liquid and suction pressure average ratio does not fall within the expected range.
• Service compressor.
Automatically clears
when the system
detects that the issue
no longer exists.
71519
Service
Urgent
HP: Incorrect
Reversing Valve Mode
• If Outdoor coil temperature plus 3°F is less than outdoor temperature or if ODT plus 3°F is greater than
ODT Coil temperature along with Reverse valve status open/closed.
• Check solenoid wiring for reverse valve.
Automatically clears
when the system
detects that the issue
no longer exists.