Lennox EL23XCV Series Manual page 61

TABLE 13. Outdoor Control 7-Segment Display Alert Codes - Compressor
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 S30/S40 thermostat on systems installed with the S30/S40 thermostat.
Inverter LED Flash
Code (number of
Alert Inverter
Codes Code
Red LED
E 433 29 2 flashes
E 439 12 1 flash
E 440 13 1 flash
E 441 14 1 flash
E 600 N/A N/A
Priority
flashes)
Green LED
Moderate
9 flashes
/ Critical
2 flashes Moderate
3 flashes Minor
4 flashes Minor
N/A Critical
Alarm Description
Error occurs when compressor peak phase current is greater
than 28A. Inverter issues code 14 first and slows down to try
to reduce the current. If the current remains high, outdoor
The inverter
unit compressor and fan stop. Antishort cycle is initiated. If
has detected a
condition occurs 5 times within an hour, system is locked out.
compressor over-
To clear, disconnect power to the indoor unit (24VAC power
current condition.
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.
Input current is approaching a high limit. Compressor speed
automatically slows. The control continues sending the
Compressor
inverter speed demanded by the thermostat. The control sets
slowdown due to high
indoor CFM and outdoor RPM to values according to demand
input current.
percentage rather than the actual Hz. Alarm is automatically
clear.
This error code is primarily for informational purposes as
the inverter controls the compressor speed to operate within
design parameters. Typically the inverter will make a minor
speed reduction of 4 Hz (approximately a 5-6% speed
reduction) for a brief period of time and to reduce the heat sink
Heat sink
temperature and will then resume normal operation. This may
temperature is
occur at high outdoor temperatures (above 110ºF) for brief
approaching limit.
periods of time (3 – 4 minutes) and is normal and expected
The compressor
operation of the inverter controlling the compressor safely
speed automatically
within design parameters.
slows to reduce heat
The inverter finned aluminum heat sink is located on the
sink temperature.
back side of the inverter in the condenser air stream. f the
The control sets
alert code 440 occur frequently, especially at lower outdoor
indoor CFM and
temperatures, check the heat sink for debris that may reduce
outdoor RPM to
heat transfer or possible obstructions that may impact air flow
values according to
across the heat sink.
demand percentage
rather than the actual The inverter will begin to briefly reduce the compressor speed
Hz. when the heat sink temperature rises above 185ºF and will
allow the inverter to resume the requested compressor
Alarm is
demand speed once the inverter heat sink reaches 176ºF.
automatically cleared.
The heat sink temperature, compressor speed in Hertz & the
Inverter Compressor Speed Reduction status ("On" or "Off ")
notification can be viewed under the outdoor unit Diagnostics
section of the thermostat dealer control center on units
installed with an S30/S40 thermostat.
Compressor
slowdown due to high
This error code is primarily for informational purposes as the
compressor current.
inverter controls the compressor to operate within design
Compressor current
parameters. Alert code 441 typically occurs at startup as the
is approaching limit.
compressor as the currently increases rapidly during startup.
The compressor
The inverter will reduce the compressor speed by 4 hz
speed automatically
and slow the compressor ramp up speed to the requested
slows. The control
compressor demand (capacity). This is normal and expected
sets indoor CFM
operation of the inverter to control the compressor within
and outdoor RPM to
design parameters. In most cases the alert code 441 does
values according to
not require any additional service or diagnostic procedures.
demand percentage
E441 may also occur if the system is operating at high
rather than the
pressures.
actual Hz. Alarm is
automatically cleared
Compressor has Load-shedding function: Provides a method for a local utility
been cycled OFF by company to limit the maximum power level usage of the
utility load-shedding outdoor unit. The feature is activated by applying 24 volts AC
function. power to the L and C terminals on the outdoor control.
Page 61
Possible Causes and Clearing Alarm