Lennox icomfort Wi-Fi - Page 60

507343-01
Page 60
Table 10. Alert Codes and Troubleshooting
Critical alerts are displayed on the Home screen, in the Home
owner alert button, and in the Installer alert button. Minor and
moderate alerts are found only in the Installer alert button.
Alert
Code
PRIORITY
CONDITION
APPLICABLE
SYSTEM
COMPONENTS
ALERT TEXT
COMPONENT OR SYSTEM OPERA
TIONAL STATE AND TROU
BLESHOOTING TIP
HOW TO CLEAR
ALERT CODE
418 Moderate
Equipment inter
face module and
outdoor unit
There is a faulty W output cir
cuit.
 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.
 Disconnect any wiring from the W
terminal.
 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 termi
nal.
Automatically clears
after fault signal is re
moved.
419 Critical
Equipment inter
face module and
outdoor unit
The W output has reported
more than five errors.
 The system will shut down the
outdoor unit.
 The W output (code E418) on the
outdoor unit has reported more
than five strikes.
 Disconnect thermostat lines from
W and verify 24VAC on the W.
 If 24VAC is present, replace the
outdoor control.
Automatically clears
after power recycled.
420 Critical
Air handler or
equipment inter
face module
The heat pump defrost cycle
has taken more than 20 min
utes to complete.
 Defrost cycle lasts longer than 20
minutes.
 Check heat pump operation.
 This is applicable only in commu
nicating indoor unit with non-com
municating heat pump.
Automatically clears
when W1 signal is re
moved.
421 Critical
Equipment inter
face module and
outdoor unit
The W output terminal on the
outdoor unit is not wired cor
rectly.
Voltage sensed on W output terminal
when Y1 out is deactivated.
Automatically clears
once voltage is not
sense on output for
power cycled.
422
Moderate
Outdoor unit
Compressor top cap switch ex
ceeding thermal limit.
 Check condenser fan motor, TXV
and indoor unit blower motor.
 Check for stuck reversing valve
or clogged refrigerant filter.
 XC/XP25: Check to ensure that
one of the wires from the top cap
switch has not been disconnected
from one of the TP terminals on
the outdoor control. Reconnect
wire if disconnected.
Automatically clears
when error is corrected.
423
Moderate /
Critical
Outdoor unit
The inverter has detected a cir
cuit issue.
 When this condition is detected
the outdoor control will stop out
door unit operations and start the
anti-short cycle timer – moderate
condition.
 Outdoor control will lockout unit
after 10 strikes within an hour –
critical condition.
 A moderate alarm
will clear automati
cally when the in
verter detects the
condition no longer
exist and will send
a clear alarm mes
sage.
 To clear critical
alarm disconnect
power to outdoor
unit and restart.