Lennox icomfort Wi-Fi, Installer'S System Setup Manual

iComfort

Wi‐Fi

®

 7-Day Programmable Communicating Thermostat

23

Table 1. Alert Codes and Troubleshooting

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.

Alert

Code

Steps to clear

Alert Text

Priority

117

Minor

(Furnace) The reporting unit has poor earth
grounding.

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.

120

Moderate

(Thermostat / Furnace / Air Handler / Out­
door Unit / Equipment Interface Module)
There is a delay in the 

(Thermostat, furnace,

air­handler or outdoor unit) 

responding to the

system.

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.

124

Critical

(Thermostat / Furnace / Air Handler / Out­
door Unit / Equipment Interface Module /
Damper Control Module)) The thermostat
has lost communication with the 

(furnace,

air­handler or outdoor unit)

 for more than 3

minutes.

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.

125

Critical

(Thermostat / Furnace / Outdoor Unit /
Damper Control Module) There is a hard­
ware problem on either the 

(Thermostat, fur­

nace control board, air­handler control board
or outdoor unit control board).

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.

126

Critical

(Furnace / Outdoor Unit) There is an internal
communication problem with the 

(furnace

control board, air­handler control board or
outdoor unit control board).

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.

130

Moderate

(Air Handler / Equipment Interface Module)
An air­handler configuration jumper is miss­
ing.

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.

131

Critical

(Thermostat / Furnace / Air Handler / Out­
door Unit / Equipment Interface Module /
Damper Control Module)) The 

(Thermostat,

furnace, air­handler or outdoor unit)

 control

parameters are corrupted.

Reconfigure the system. Replace the control if heating or cooling is not available.

132

Critical

(Air Handler / Damper Control Module) The
device's control software is corrupted.

Recycle power. If failure re­occurs, replace the control. System reset is required to recov­
er.