Lennox icomfort Wi-Fi - Page 35

iComfort Wi‐Fi
®
7-Day Programmable Communicating Thermostat
35
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 clearAlert TextPriority
594
Moderate /
Critical
(Equipment Interface Module) Precoil dis
charge air temperature sensor problem
(DFM mode only). Advances from moderate
to critical after ten (10) minutes.
Interlock relay energized, but input not sensed after 3 seconds. No heating and cooling
operations. Deenergize interlock relay and reenergized 5 minutes later if demand is still
present. Alarm clears 5 minutes after fault clears.
600 Critical
Compressor has been cycled OFF on utility
load shedding.
Load shedding function: Provides a method for a local utility company to limit the maximum
power level usage of the outdoor unit. The feature is activated by applying 24 volts AC
power to the L and C terminals on the outdoor control.
601 Critical
Outdoor unit has been cycled OFF on low
temperature protection.
Low temperature Protection: Outdoor unit will not operate when the outdoor temperature is
at or below 4°F (20°C). If the unit is operating and the outdoor temperature drops below
4°F (20°C), the unit will continue to operate until the room thermostat is satisfied or the
outdoor temperature drops to 15°F (26°C). (Outdoor unit ambient sensor provides tem
perature readings).
700 Moderate
(Thermostat) The temperature sensor in the
thermostat is not working properly.
Recalibrate thermostat to clear. Replace thermostat if needed.
701 Moderate
(Thermostat) The thermostat is reading in
door temperatures above the prepro
grammed limit.
Recalibrate thermostat to clear; cool thermostat; adjust setpoint. Replace thermostat, if
needed.
702 Moderate
(Thermostat) The thermostat is reading in
door temperatures below the prepro
grammed limit.
Recalibrate thermostat to clear; warm thermostat; adjust setpoint. Replace thermostat, if
needed.
703 Moderate
(Thermostat) The humidity sensor in the
thermostat is not working properly.
Recalibrate thermostat to clear; adjust setpoint. Replace thermostat, if needed.
704 Moderate
(Thermostat) The thermostat is reading in
door humidity levels above the prepro
grammed limit.
Recalibrate thermostat to clear. Replace thermostat, if needed.
705 Moderate
(Thermostat) The thermostat is reading in
door humidity levels below the prepro
grammed limit.
Recalibrate thermostat to clear. Replace thermostat, if needed.
Ohm
Check
—
The ohm reading in the system is either too
high or too low.
Ohm reading between i+ and i anywhere on the RSBus with supply power off should be
between 70 and 90 ohms. If above 90 ohms, check and repair wiring, splices or other
wiring defects that may be causing the excessive resistance. If less than 70 ohms, check
for shorted wires.