Lennox iComfort SL18XC-01 Installer Setup Manual page 27

Table 1. Alert Codes and Troubleshooting
Alert
Priority Alert Text
Code
(Furnace / Air Handler / Damper Control
310 Critical Module) There is a problem with (furnace or
air­handler) discharge air sensor.
(Furnace) The heat firing rate has been re­
311 Minor duced to match available airflow (cutback
mode).
(Furnace / Air Handler) The blower cannot
312 Minor provide the requested CFM due to high stat­
ic.
(Furnace / Air Handler) The indoor and out­
313 Minor
door unit capacities do not match.
344 Critical (Furnace) Relay Y1 Failure
(Air Handler / Equipment Interface Module /
Heat Pump) The "O" relay on the air­handler
345 Critical
has failed. Either the pilot relay contacts did
not close or the relay coil did not energize.
(Air Handler) The heat pump jumper was not
346 Critical
removed on the air­handler control board.
(Furnace / Air Handler / Equipment Interface
Module) The "Y1" relay on the (furnace or
347 Critical air­handler) has failed. Either the pilot relay
contacts did not close or the relay coil did
not energize.
(Furnace / Air Handler) The "Y2" relay on the
(furnace or air­handler) has failed. Either the
348 Critical
pilot relay contacts did not close or the relay
coil did not energize.
(Furnace) The "O" to "R" jumper on the fur­
349 Critical
nace needs to be restored.
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
Compare outdoor sensor resistance to temperature/resistance charts in installation in­
structions. Replace sensor if necessary. The alarm/fault is cleared 30 seconds after fault is
detected as recovered.
Warning Only. Furnace blower in cutback mode due to restricted airflow. Reduce firing rate
every 60 seconds to match available CFM. Check filter and duct system. To clear, replace
filter if needed or repair/add duct. 2­stage controls will reduce firing rate to 1st stage. The
alarm/fault clears when a heat call finishes successfully.
Warning Only. Restricted airflow ­ Indoor blower is running at a reduced CFM (Cutback
Mode ­ The variable speed motor has pre­set speed and torque limiters to protect the
motor from damage caused by operating outside of design parameters (0 to 0.8" e.g.. total
external static pressure). Check filter and duct system. To clear, replace filter if needed or
repair/add duct. The alarm/fault is cleared after the current service demand is satisfied.
Check for proper configuring in installation instructions. Alarm is just a warning. The sys­
tem will operate, but might not meet efficiency and capacity parameters. The alarm will
clear after commissioning is complete.
Y1 relay failed; operation stopped. Alarm clears 300 seconds after Y1 input sensed OFF.
O relay / Stage 1 failed. Pilot relay contacts did not close or the relay coil did not energize.
Replace control. Cleared after the fault recovered following reset.
Configuration link(s) not removed on control. Cut O­R. Applicable with non communicating
outdoor unit with communicating indoor system.
Operation stopped. Y1 relay / Stage 1 failed. (Pilot relay contacts did not close or
the relay coil did not energize; no input back to IFC chip). Critical Alert. Cleared after reset
and Y1 input sensed.
Y2 relay / Stage 2 failed. (Pilot relay contacts did not close or the relay coil did not ener­
gize; no input back to IFC chip). Critical Alert. Cleared after reset and Y1 input sensed.
Configuration link R to O needs to be restored. Replace link or hard­wire. Applicable in non
communicating mode. Critical Alert.
27 iComfort Wi‐Fi
®
7-Day Programmable Communicating Thermostat