Lennox iComfort SL18XC-01 Installer Setup Manual page 23

Table 1. Alert Codes and Troubleshooting
Alert
Priority Alert Text
Code
(Furnace) The reporting unit has poor earth
117 Minor
grounding.
(Thermostat / Furnace / Air Handler / Out­
door Unit / Equipment Interface Module)
120 Moderate There is a delay in the (Thermostat, furnace,
air­handler or outdoor unit) responding to the
system.
(Thermostat / Furnace / Air Handler / Out­
door Unit / Equipment Interface Module /
Damper Control Module)) The thermostat
124 Critical
has lost communication with the (furnace,
air­handler or outdoor unit) for more than 3
minutes.
(Thermostat / Furnace / Outdoor Unit /
Damper Control Module) There is a hard­
125 Critical ware problem on either the (Thermostat, fur­
nace control board, air­handler control board
or outdoor unit control board).
(Furnace / Outdoor Unit) There is an internal
communication problem with the (furnace
126 Critical
control board, air­handler control board or
outdoor unit control board).
(Air Handler / Equipment Interface Module)
130 Moderate An air­handler configuration jumper is miss­
ing.
(Thermostat / Furnace / Air Handler / Out­
door Unit / Equipment Interface Module /
131 Critical Damper Control Module)) The (Thermostat,
furnace, air­handler or outdoor unit) control
parameters are corrupted.
(Air Handler / Damper Control Module) The
132 Critical
device's control software is corrupted.
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
Provide proper grounding for the unit. Check for proper earth ground to the system. The
alarm/code will clear 30 seconds after it is corrected.
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.
Equipment lost communication with the thermostat. Check the wiring connections, ohm
wires and cycle power. The alarm stops all associated HVAC operations and waits for a
heartbeat message from the unit that's not communicating. The alarm/fault clears after
communication is re­established.
There is a control hardware problem. Replace the control if the problem prevents opera­
tion and is persistent. The alarm/fault is cleared 300 seconds after the fault recovers.
There is an internal hardware problem on the control. Typically the control will re­set itself.
Replace the control if the problem prevents operation and is persistent. The alarm/fault is
cleared 300 seconds after the fault recovers.
Configuration jumper(s) missing on control (applicable in non­communicating applications
only). Replace the jumper or put wire between terminals on control. Cleared after jumper is
connected.
Reconfigure the system. Replace the control if heating or cooling is not available.
Recycle power. If failure re­occurs, replace the control. System reset is required to recov­
er.
23 iComfort Wi‐Fi
®
7-Day Programmable Communicating Thermostat