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.