System Operation And Service - Lennox EL23XCV Series Manual

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/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 follow-
ing methods:
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/dehumidifi-
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.
Inverter LED Flash Code
Alert Inverter
(number of flashes)
Codes Code
Red LED
N/A N/A ON
N/A N/A ON
N/A N/A OFF
E105 N/A N/A
E120 N/A N/A
E124 N/A N/A
E125 N/A N/A
E131 N/A N/A
E132 N/A N/A
E180 N/A N/A
E181 N/A N/A
E182 N/A N/A

System Operation and Service

Priority
Green LED
OFF N/A EL23XCV-024, -036 only: Indicates inverter is operating normally.
ON N/A EL23XCV-048, -060 only: Indicates inverter is operating normally.
OFF N/A Indicates inverter is NOT energized.
The outdoor control has lost
N/A Moderate communication with either the
thermostat or indoor unit.
There is a delay in the outdoor
N/A Moderate
unit responding to the system.
The S30/S40 thermostat has
lost communication with the
N/A Critical
outdoor unit for more than 3
minutes.
There is a hardware problem
N/A Critical
with the outdoor control.
The outdoor unit control
N/A Critical
parameters are corrupted.
N/A Critical Internal software error.
The outdoor unit ambient
temperature sensor has
N/A Critical malfunctioned. As a result the
outdoor unit control will not
perform low ambient cooling.
Suction pressure transducer
N/A Moderate
fault.
Suction temperature sensor has
N/A Moderate
malfunctioned.
• Disconnecting R wire from the outdoor control R termi-
nal.
• 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 con-
tinues to monitor the unit's system and compressor
operations. When/if conditions return to normal, the
alert code is turned off automatically.
NOTE - Error codes can be recalled by following informa-
tion shown in the table on page 37.
Alarm Description
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.
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.
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.
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.
Reconfigure the system. Replace the control if heating or cooling
is not available.
Replace outdoor control.
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) configuration, 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 configuration, or when
normal values are sensed.
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.
Check temperature sensor in the applicable installation and
service procedure. Nominal resistance is 10K Ohms at 77F.
Page 35
Possible Causes and Clearing Alarm