Lennox XC25-060-230-01 - III. SYSTEM OPERATION AND SERVICE; 7-Segment Alert and System Status Codes; Resetting Alert Codes

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XC25
III. SYSTEM OPERATION AND SERVICE
7-Segment Alert and System Status Codes
Alert codes are displayed using the 7-segment display loc
ated on the outdoor control.
NOTE - System fault and lockout codes take precedence
over system status codes (cooling, heating operating per
centages or defrost/dehumidification).
The 7-segment will display an abnormal condition (error
code) when detected in the system. A list of the codes are
shown in table 6.
RESETTING ALERT CODES
Alert codes can be reset manually or automatically:
1. Manual Reset
Manual reset can be achieved by one of the following
methods:
• Disconnecting R wire from the outdoor control R
terminal.
• Turning the indoor unit off and back on again
After power up, all currently displayed codes are
cleared.
2. Automatic Reset
After an alert is detected, the outdoor control continues
to monitor the unit's system and compressor opera
tions. When/if conditions return to normal, the alert
code is turned off automatically.
NOTE - Error codes can be recalled by following in
formation shown in the table on page 35.
Table 6. Outdoor Control 7-Segment Display Alert Codes and Inverter LED Flash Codes
NOTE - System fault and lockout codes take precedence over system status codes (cooling, heating operating percentages
or defrost/dehumidification). Only the latest active fault or lockout codes are displayed (if present). If no fault or lockout codes
are active, then system status codes are displayed. Alert codes are also displayed on the iComfort Wi-Fi
®
thermostat.
Alert
Codes
Inverter
Code
Inverter LED Flash
Code (number of
flashes)
Priority Alarm Description Possible Causes and Clearing Alarm
Red LED Green LED
N/A N/A ON OFF N/A XC/XP 25-024 and -036 only: Indicates inverter is operating normally.
N/A N/A ON ON N/A XC/XP 25-048 and -060 only: Indicates inverter is operating normally.
N/A N/A OFF OFF N/A Indicates inverter is NOT energized.
E 105 N/A N/A N/A Moderate
The outdoor control
has lost communic
ation with either the
thermostat or in
door unit.
Equipment is unable to communicate. Indicates numerous
message errors. In most cases errors are related to electrical
noise. Make sure high voltage power is separated from RS
Bus. Check for miswired and/or loose connections between
the stat, indoor unit and outdoor unit. Check for a high voltage
source of noise close to the system. Fault clears after commu
nication is restored.
E 120 N/A N/A N/A Moderate
There is a delay in
the outdoor unit re
sponding to the
system.
Typically, this alarm/code does not cause any issues and
clears on its own. The alarm / code is usually caused by a
delay in the outdoor unit responding to the thermostat. Check
all wiring connections. Cleared after unresponsive device re
sponds to any inquiry.
E 124 N/A N/A N/A Critical
The iComfort WiFi
®
thermostat has lost
communication with
the outdoor unit for
more than 3
minutes.
Equipment lost communication with the thermostat. Check the
wiring connections, ohm wires and cycle power. The alarm
stops all associated HVAC operations and waits for a heartbeat
message from the unit that's not communicating. The alarm /
fault clears after communication is reestablished.
E 125 N/A N/A N/A Critical
There is a hardware
problem with the
outdoor control.
There is a control hardware problem. Replace the outdoor con
trol if the problem prevents operation and is persistent. The
alarm / fault is cleared 300 seconds after the fault recovers.
E 131 N/A N/A N/A Critical
The outdoor unit con
trol parameters are
corrupted.
Reconfigure the system. Replace the control if heating or cool
ing is not available.
E 132 N/A N/A N/A Critical
Internal software er
ror.
Replace outdoor control.
E 180 N/A N/A N/A Critical
The outdoor unit am
bient temperature
sensor has malfunc
tioned. As a result
the outdoor unit con
trol will not perform
low ambient cooling.
In normal operation, after outdoor control recognizes sensors,
the alarm is sent if valid temperature reading is lost. Compare
outdoor sensor resistance to temperature/resistance charts in
unit installation instructions. Replace sensor pack if necessary.
At the beginning of (any) configuration, furnace or airhandler
control detects the presence of the sensor(s). If detected (read
ing in range), appropriate feature is shown in the iComfort
WiFi
®
thermostat About screen. The alarm / fault clears upon
configuration, or when normal values are sensed.