Lennox 11U61 Setup And Installation Manual page 31

Table 2. Alert Codes and Troubleshooting
Alert
Priority Alert Text
Code
(Thermostat) The system has been
36 Critical heating for at least 15 minutes,
without a demand for heating.
(Thermostat) The system has been
cooling for at least 15 minutes, without
37 Critical
a demand for cooling.
(Thermostat) The system has not
been able to turn on the heating for
more than 45 minutes. The system
38 Critical
will go offline for 60 minutes and try
again.
(Thermostat) The system has not
been able to turn on the cooling for
more than 45 minutes. The system
39 Critical
will go offline for 60 minutes and try
again.
(Thermostat / Furnace / Air Handler /
Outdoor Unit / Equipment Interface
Module) There is a delay in the (Ther­
120 Moderate
mostat, furnace, air­handler or out­
door unit) responding to the system.
Critical alerts are displayed on Home (user) screen, in the Homeowner alert button, and in
the Installer alert button. Minor and Moderate alerts are found only in the Installer alert
button.
Steps to clear
Run the system in diagnostic mode and verify that it matches actual equipment
operation. Check for other alarms/codes that may be preventing the system
from operating as expected.
Step 1: Check all heating equipment to determine cause of heating demand.
Step 2: Recycle power.
System will clear code when it detects condition has cleared.
Run the system in diagnostic mode and verify that it matches actual equipment
operation. Check for other alarms/codes that may be preventing the system
from operating as expected.
Step 1: Check all cooling equipment to determine cause of cooling demand.
Step 2: Recycle power.
System will clear code when it detects condition has cleared.
Run the system in diagnostic mode and verify that it matches actual equipment
operation. Check for other alarms/codes that may be preventing the system
from operating as expected.
Step 1: Check all heating equipment to determine cause.
Step 2: Recycle power.
System will clear code when it detects condition has cleared.
Run the system in diagnostic mode and verify that it matches actual equipment
operation. Check for other alarms/codes that may be preventing the system
from operating as expected.
Step 1: Check all cooling equipment to determine cause.
Step 2: Recycle power.
System will clear code when it detects condition has cleared.
Typically, this alarm/code does not cause any issues and will clear on its own.
The alarm/code is usually caused by a delay in the outdoor unit responding to
the thermostat. Check all wiring connections. Cleared after unresponsive
device responds to any inquiry.
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7-Day Programmable iComfort Wi‐Fi
®
Flex Thermostat