Lennox iComfort Wi-Fi Setup Manual page 60

Table 10. Alert Codes and Troubleshooting
Alert PRIORITY
Code CONDITION
418 Moderate
419 Critical
420 Critical
421 Critical
Moderate
422
Moderate /
423
Critical
507343-01
APPLICABLE
SYSTEM
COMPONENTS
Equipment inter­
There is a faulty W output cir­
face module and
cuit.
outdoor unit
Equipment inter­
The W output has reported
face module and
more than five errors.
outdoor unit
Air handler or
The heat pump defrost cycle
has taken more than 20 min­
equipment inter­
utes to complete.
face module
Equipment inter­
The W output terminal on the
face module and outdoor unit is not wired cor­
rectly.
outdoor unit
Compressor top cap switch ex­
Outdoor unit
ceeding thermal limit.
The inverter has detected a cir­
Outdoor unit
cuit issue.
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.
COMPONENT OR SYSTEM OPERA­
ALERT TEXT
•
•
•
•
•
•
•
•
•
•
•
•
Voltage sensed on W output terminal
when Y1 out is deactivated.
•
•
•
•
•
Page 60
TIONAL STATE AND TROU­
BLESHOOTING TIP
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.
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.
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.
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.
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.
HOW TO CLEAR
ALERT CODE
Automatically clears
after fault signal is re­
moved.
Automatically clears
after power recycled.
Automatically clears
when W1 signal is re­
moved.
Automatically clears
once voltage is not
sense on output for
power cycled.
Automatically clears
when error is corrected.
•
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.