Lennox iComfort S30 Installation And Setup Manual page 42

Table 1. Alert Codes and Troubleshooting
Applicable
Alert Priority
System
Code Condition
Components
417 Critical Outdoor unit
Moderate IHarmony Damper
417
/ Critical control module
Equipment
interface module
418 Moderate
and outdoor unit
Equipment
419 Critical interface module
and outdoor unit
Critical alerts are displayed on the Home 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 Text Component or System Operational State and Troubleshooting Tip
" Outdoor unit control will not perform demand or time / temperature defrost operation.
(System will still heat or cool.)
" Outdoor unit control detects open or shorted sensor, or temperature that is out of
sensor range.
" Critical alert after 10 minutes.
The outdoor unit dis­
" Reset by replacing sensor.
charge sensor is either
" This fault is detected by allowing the unit to run for 90 seconds before checking sen­
open, short-circuited or
the temperature is out of
sor resistance.
sensor range.
" If the sensor resistance is not within range after 90 seconds, the board will count one
fault.
" After five faults, the outdoor control will lock out.
" Check for proper sensor reading and attachment to line.
" Replace outdoor control or sensor if out-of-specifications.
" Outdoor control will not perform any defrost tempering – moderate condition.
" The damper control module detects open or shorted discharge sensor, or tempera­
ture that is out of discharge sensor range.
" Check the resistance of the discharge sensor and compare to temperature resis­
The damper control dis­
tance chart - replace if needed.
charge air temperature
" Reset by replacing the discharge sensor.
sensor is either open,
" This fault is detected by allowing the unit to run for 90 seconds before checking dis­
short-circuited or the tem­
perature is out of sensor
charge sensor resistance.
range.
" If the discharge sensor resistance is not within range after 90 seconds, the control
will count one fault.
" After five faults, the control will lock out – critical condition.
" Check for proper sensor reading and attachment to line.
" W terminal is energized while in cooling mode.
" Possible cause may be a stuck closed relay on the control, or something external
to the control that is energizing W terminal when it should not be energized.
There is a faulty W output
" Disconnect any wiring from the W terminal.
circuit.
" If 24VAC is still on the terminal, then it is a stuck relay.
" If 24VAC disappears, then there is a need to check any of the wires hooked up to
the W terminal.
" The system will shut down the outdoor unit.
" The W output (code E418) on the outdoor unit has reported more than five strikes.
The W output has report­
ed more than five errors. " Disconnect thermostat wire from W and verify there is no 24VAC on the W.
" If 24VAC is present, replace the outdoor control.
42
How to clear alert code
Automatically clears when the
system detects that the issue no
longer exists.
Automatically clears after a power
reset.
Automatically clears after fault sig­
nal is removed.
Automatically clears after power
recycled.