Lennox iComfort SL18XC-01 Installer Setup Manual page 35

Table 1. Alert Codes and Troubleshooting
Alert
Priority Alert Text
Code
(Equipment Interface Module) Pre­coil dis­
Moderate / charge air temperature sensor problem
594
Critical (DFM mode only). Advances from moderate
to critical after ten (10) minutes.
Compressor has been cycled OFF on utility
600 Critical
load shedding.
Outdoor unit has been cycled OFF on low
601 Critical
temperature protection.
(Thermostat) The temperature sensor in the
700 Moderate
thermostat is not working properly.
(Thermostat) The thermostat is reading in­
701 Moderate door temperatures above the pre­pro­
grammed limit.
(Thermostat) The thermostat is reading in­
702 Moderate door temperatures below the pre­pro­
grammed limit.
(Thermostat) The humidity sensor in the
703 Moderate
thermostat is not working properly.
(Thermostat) The thermostat is reading in­
704 Moderate door humidity levels above the pre­pro­
grammed limit.
(Thermostat) The thermostat is reading in­
705 Moderate door humidity levels below the pre­pro­
grammed limit.
Ohm The ohm reading in the system is either too
—
Check high or too low.
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
Interlock relay energized, but input not sensed after 3 seconds. No heating and cooling
operations. De­energize interlock relay and re­energized 5 minutes later if demand is still
present. Alarm clears 5 minutes after fault clears.
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.
Low temperature Protection: Outdoor unit will not operate when the outdoor temperature is
at or below ­4°F (­15.6°C). If the unit is operating and the outdoor temperature drops be­
low ­4°F (­15.6°C), the unit will continue to operate until the room thermostat is satisfied or
the outdoor temperature drops to ­15°F (­9.4°C). (Outdoor unit ambient sensor provides
temperature readings).
Recalibrate thermostat to clear. Replace thermostat if needed.
Recalibrate thermostat to clear; cool thermostat; adjust setpoint. Replace thermostat, if
needed.
Recalibrate thermostat to clear; warm thermostat; adjust setpoint. Replace thermostat, if
needed.
Recalibrate thermostat to clear; adjust setpoint. Replace thermostat, if needed.
Recalibrate thermostat to clear. Replace thermostat, if needed.
Recalibrate thermostat to clear. Replace thermostat, if needed.
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.
35 iComfort Wi‐Fi
®
7-Day Programmable Communicating Thermostat