Page 35
7-SEGMENT ALERT AND SYSTEM STATUS CODES
Alert codes are displayed using the 7-segment display lo-
cated on the outdoor control.
NOTE - System fault and lockout codes take precedence
over system status codes (cooling, heating operating per-
centages or defrost/dehumidication).
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 follow-
ing methods:
• Disconnecting R wire from the outdoor control R termi-
nal.
• Turning the indoor unit o and back on again
After power up, all currently displayed codes are cleared.
2 - Automatic Reset
After an alert is detected, the outdoor control con-
tinues to monitor the unit's system and compressor
operations. When/if conditions return to normal, the
alert code is turned o automatically.
NOTE - Error codes can be recalled by following informa-
tion shown in the table on page 37.
System Operation and Service
TABLE 7. 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/dehumidi-
cation). 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 S30/S40 thermostat.
Alert
Codes
Inverter
Code
Inverter LED Flash Code
(number of ashes)
Priority Alarm Description Possible Causes and Clearing Alarm
Red LED Green LED
N/A N/A ON OFF N/A EL23XCV-024, -036 only: Indicates inverter is operating normally.
N/A N/A ON ON N/A EL23XCV-048, -060 only: Indicates inverter is operating normally.
N/A N/A OFF OFF N/A Indicates inverter is NOT energized.
E105 N/A N/A N/A Moderate
The outdoor control has lost
communication with either the
thermostat or indoor 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 RSBus.
Check for miswired 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 communication is
restored.
E120 N/A N/A N/A Moderate
There is a delay in the outdoor
unit responding 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 responds to any
inquiry.
E124 N/A N/A N/A Critical
The S30/S40 thermostat has
lost communication with the
outdoor unit for more than 3
minutes.
Equipment lost communication with the thermostat. Check the
wiring connections and resistance, then cycle the system power.
This alarm stops all associated HVAC operations and waits for a
signal from the non-communicating unit. The alarm / fault clears
after communication is re-established.
E125 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 control
if the problem prevents operation and is persistent. The alarm /
fault is cleared 300 seconds after the fault recovers.
E131 N/A N/A N/A Critical
The outdoor unit control
parameters are corrupted.
Recongure the system. Replace the control if heating or cooling
is not available.
E132 N/A N/A N/A Critical Internal software error. Replace outdoor control.
E180 N/A N/A N/A Critical
The outdoor unit ambient
temperature sensor has
malfunctioned. As a result the
outdoor unit control will not
perform low ambient cooling.
Valid temperature reading is lost during normal operation and after
outdoor control recognized sensors. Compare outdoor sensor
resistance to temperature/ resistance charts in unit installation
instructions. Replace sensor pack if necessary. At the beginning
of (any) conguration, furnace or airhandler control detects
the presence of the sensor(s). If detected (reading in range),
appropriate feature is shown in the iComfort S30 thermostat
About screen. The alarm / fault clears upon conguration, or when
normal values are sensed.
E181 N/A N/A N/A Moderate
Suction pressure transducer
fault.
Suction pressure transducer is out of range. The signal should be
between 0.5 VDC and 4.5 VDC between blue and black. The error
code will be cleared when proper signal is provided.
E182 N/A N/A N/A Moderate
Suction temperature sensor has
malfunctioned.
Check temperature sensor in the applicable installation and
service procedure. Nominal resistance is 10K Ohms at 77F.
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