97
Table 19. Alert Codes and Troubleshooting
GF= Gas Furnace, AH=Air Handler, ID=Indoor unit (GF or AH), HP=Heat Pump, AC=Air Conditioner, OD=Outdoor Unit (AC or HP), PA=Pure Air S, ZA=Zone system and TS=Thermostat
Alert
Code
Inverter
Flash
Code
Priority
Condition
Actual Displayed
Alert Text
Under dealer
control center >
Notifications
Component or System Operational State and Troubleshooting Tip
How to clear alert code
65539
Service
Urgent
Thermostat Lost
Connection Or
Internal Fault
• HD wall display not detected for more than 30 seconds.
•
Solid blue LED will appear on mag-mount if powered. Only on versions with mag-mount.
•
Flashing blue LED will appear if not communicating with smart hub. Only on versions with mag-
mount.
•
Typically the thermostat will send a command to the unknown device and place it in a soft
disable state.
The Lennox communicating control with the soft disable state will indicate so as follows:
• On air handler, furnace and outdoor controls, the state is displayed by double horizontal lines
on seven-segment display.
•
On the damper control module, the green LED will flash 3 seconds on and 1 second off.
•
On the equipment interface module, the green LED will flash 3 seconds on and 1 second off.
Cycling power to the soft disabled control may clear the condition. If cycling power does not clear
the soft disable state then replace control.
Automatically clears once is detected
for two seconds.
65540
Information
Only-Dealer
Missing HD wall
display
• HD wall display not detected for less than 30 seconds.
•
Solid blue LED will appear on mag-mount if powered. Only on versions with mag-mount.
•
Blinking blue LED will appear if not communicating with smart hub. Only on versions with mag-
mount.
•
Typically the thermostat will send a command to the unknown device and place it in a soft
disable state.
The Lennox communicating control with the soft disable state will indicate so as follows:
• On air handler, furnace and outdoor controls, the state is displayed by double horizontal lines
on seven-segment display.
• On the damper control module, the green LED will blink three seconds on and one second off.
• On the equipment interface module, the green LED will blink three seconds on and one second
off.
Cycling power to the soft disabled control may clear the condition. If cycling power does not clear
the soft disable state then replace control.
Automatically clears once is detected
for two seconds.
