Iii. System Operation And Service; 7-Segment Alert And System Status Codes - Lennox XC25-024-230-01 Installation And Service Procedure

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:
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
Inverter LED Flash
Code (number of
Alert Inverter
Code
Codes
Red LED
N/A N/A ON
N/A N/A ON
N/A N/A OFF
E 105 N/A N/A
E 120 N/A N/A
E 124 N/A N/A
E 125 N/A N/A
E 131 N/A N/A
E 132 N/A N/A
E 180 N/A N/A
XC25

III. SYSTEM OPERATION AND SERVICE

Priority
flashes)
Green LED
OFF N/A
ON N/A
OFF N/A
N/A Moderate
N/A Moderate
N/A Critical
N/A Critical
N/A Critical
N/A Critical
N/A Critical
•
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.
Alarm Description
XC/XP 25-024 and -036 only: Indicates inverter is operating normally.
XC/XP 25-048 and -060 only: Indicates inverter is operating normally.
Indicates inverter is NOT energized.
Equipment is unable to communicate. Indicates numerous
The outdoor control message errors. In most cases errors are related to electrical
has lost communic­ noise. Make sure high voltage power is separated from RS­
ation with either the Bus. Check for mis­wired and/or loose connections between
thermostat or in­
the stat, indoor unit and outdoor unit. Check for a high voltage
door unit.
source of noise close to the system. Fault clears after commu­
nication is restored.
Typically, this alarm/code does not cause any issues and
There is a delay in
clears on its own. The alarm / code is usually caused by a
the outdoor unit re­
delay in the outdoor unit responding to the thermostat. Check
sponding to the
all wiring connections. Cleared after unresponsive device re­
system.
sponds to any inquiry.
®
The iComfort Wi­Fi
Equipment lost communication with the thermostat. Check the
thermostat has lost
wiring connections, ohm wires and cycle power. The alarm
communication with
stops all associated HVAC operations and waits for a heartbeat
the outdoor unit for
message from the unit that's not communicating. The alarm /
more than 3
fault clears after communication is re­established.
minutes.
There is a hardware There is a control hardware problem. Replace the outdoor con­
problem with the trol if the problem prevents operation and is persistent. The
outdoor control. alarm / fault is cleared 300 seconds after the fault recovers.
The outdoor unit con­
Reconfigure the system. Replace the control if heating or cool­
trol parameters are
ing is not available.
corrupted.
Internal software er­
Replace outdoor control.
ror.
In normal operation, after outdoor control recognizes sensors,
The outdoor unit am­ the alarm is sent if valid temperature reading is lost. Compare
bient temperature outdoor sensor resistance to temperature/resistance charts in
sensor has malfunc­
unit installation instructions. Replace sensor pack if necessary.
tioned. As a result
At the beginning of (any) configuration, furnace or air­handler
the outdoor unit con­ control detects the presence of the sensor(s). If detected (read­
trol will not perform ing in range), appropriate feature is shown in the iComfort
®
low ambient cooling. Wi­Fi
configuration, or when normal values are sensed.
30
Possible Causes and Clearing Alarm
thermostat About screen. The alarm / fault clears upon
®
thermostat.