Lennox iComfort SL18XC-01 Installer Setup Manual page 20

Table 1. Alert Codes and Troubleshooting
Alert
Priority Alert Text
Code
(Thermostat) The thermostat has found an
10 Critical
unknown device on the system.
(Thermostat) The thermostat cannot find a
11 Critical
previously installed unit.
(Thermostat) The thermostat cannot find an
12 Critical
iComfort®­enabled indoor unit.
(Thermostat) The thermostat found more
than one thermostat, more than one indoor
14 Critical
unit, or more than one outdoor unit on the
system.
(Thermostat) The outside temperature is be­
low the level where the heat pump is pro­
18 Minor
grammed to heat the home. The system will
not use the heat pump to warm your home.
(Thermostat) The outside temperature is
higher than the level where the furnace or
19 Minor electric heat is programmed to work. The
system will only use the heat pump to warm
your home.
(Thermostat) The thermostat is reading an
indoor temperature that is higher than 99ºF.
29 Critical The thermostat will not allow any heating op­
eration to begin until it senses a temperature
lower than 99ºF.
(Thermostat) The thermostat is reading an
indoor temperature that is lower than 40ºF.
30 Moderate The thermostat will not allow any cooling op­
eration to begin until it senses a temperature
higher than 40ºF.
507341-02
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
An unknown device is seen on the sub­net in or outside of configuration mode. Clear by
reconfiguring the system. Touch the setup tab, touch start, and touch confirm. If problem
persists, then check all DEVICE connections to make sure they are iComfort
Check all connections and cycle system power. If problem persists, clear by reconfiguring
the system. Press the setup tab, touch start, and touch confirm. If problem persists, then
check all DEVICE connections to make sure they are iComfort
Thermostat did not find an Indoor Unit. Make sure there is an iComfort® indoor unit on the
system. Check R, i+, i­ and C connections, ohm wires and cycle power. Replace indoor
unit control board if there is no response.
Check wiring and remove duplicate equipment. Reconfigure system.
Notification only ­ Outdoor Temp is below the Low Balance Point. Heat Pump will not be
used to service a heating demand.
Notification only ­ Outdoor Temp is above the High Balance Point. Indoor Unit (furnace or
air­handler) will not be used to service a heating demand.
Indoor temperature rose above 99ºF during a heating or cooling demand. Heating opera­
tion is not allowed. Check to ensure that Heating Equipment is not stuck ON (reversing
valve, etc.). Check the accuracy of the thermostat temperature sensor. Select cooling
system mode to cool the indoor space.
Indoor Temp fell below 40ºF. Cooling operation is not allowed. Check to ensure that cool­
ing equipment is not stuck ON. Check accuracy of the thermostat temperature sensor.
Select heating system mode to heat the indoor space to above 40ºF.
20
®
­compatible.
®
­compatible.