Lennox EL23XCV Series Manual page 72

ERROR CODES:
TABLE 20. 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 (number of
Alert Inverter
flashes)
Codes Code
Red LED
E 423 40 4 flashes
E 426 N/A N/A
E 427 21 2 flashes
E 428 22 2 flashes
E 429 23 2 flashes
Priority Alarm Description
Green
LED
Moderate / The inverter has detected a
OFF
Critical circuit problem.
N/A Critical Excessive inverter alarms
Moderate / The inverter has detected a
1 flash
Critical DC peak fault condition.
The inverter has detected
Moderate /
2 flashes a high main input current
Critical
condition
On a call for compressor
operation, if DC link power
in inverter does not rise
above 180 VDC for 2 and
3 ton models, 250 VDC for
4 and 5 ton models, within
30 seconds, the control will
display a moderate code.
Moderate /
3 flashes If condition is detected,
Critical
outdoor unit will stop
(Compressor and fan).
Antishort cycles is initiated.
If condition occurs 10
times within a 60 minute
rolling time period, system
will lock out and display a
critical code.
Control will lock out after 10 strikes within an hour.
To clear, disconnect power to the indoor unit (24VAC
power source to the outdoor control) which will power
off the outdoor control and will open the outdoor unit
contactor, which interrupts power to the inverter and then
re-apply power.
After ten faults within one hour, control will lock out.
Indicates poor system operation. Review history of alarms
to resolve system setup. Check condenser fan motor,
TXV, indoor unit blower motor, stuck reversing valve, over-
charge, undercharge, and clogged refrigerant filter.
To clear, disconnect power to the indoor unit (24VAC
power source to the outdoor control) which will power
off the outdoor control and will open the outdoor unit
contactor, which interrupts power to the inverter and then
re-apply power. Inverter alarms 12 to 14 and 53 do not
count towards this lock out condition.
If condition (55A or higher) is detected, outdoor unit will
stop (compressor and fan). Antishort cycle is initiated. If
peak current (55A or higher) occurs 10 times within an
hour, system will lock out.
Indicates high pressure, condenser fan failure, locked
compressor rotor or overcharge. To clear, disconnect
power to the indoor unit (24VAC power source to the
outdoor control) which will power off the outdoor control
and will open the outdoor unit contactor, which interrupts
power to the inverter and then re-apply power.
If condition is detected, outdoor unit will stop (compressor
and fan). Antishort cycle is initiated. If condition occurs 5
times within an hour, system will lock out.
Indicates high pressure, condenser fan failure or
overcharge. To clear, disconnect power to the indoor unit
(24VAC power source to the outdoor control) which will
power off the outdoor control and will open the outdoor
unit contactor, which interrupts power to the inverter and
then re-apply power.
Issues:
(1) If DC link power in inverter does not rise above 180
VDC for 2- and 3-ton models, 250 VDC for 4- and
5-ton models, within 30 seconds, the outdoor control
will display a moderate code.
(2) Capacitors on inverter do not properly charge.
Corrective Actions:
(1) Check for proper main power to outdoor unit and for
any loose electrical connections.
Page 72
Possible Causes and Clearing Alarm