Lennox XC25-036-230-01 - Page 68

68
XC25
Table Table 18 continued
Alert
Codes
Inverter
Code
Inverter LED Flash
Code (number of
flashes)
Priority Alarm Description Possible Causes and Clearing Alarm
Red LED Green LED
E 427 21 2 flashes 1 flash
Moderate /
Critical
The inverter has de
tected a DC peak
fault condition
.
If condition (55A or higher) is detected, outdoor unit will stop (compressor and fan).
Antishort 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 over
charge.
To clear, disconnect power to outdoor unit and restart.
E 428 22 2 flashes 2 flashes
Moderate /
Critical
The inverter has de
tected a high main in
put current condition
.
If condition is detected, outdoor unit will stop (compressor and fan). Antishort 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 outdoor unit and restart.
E 429 23 2 flashes 3 flashes
Moderate /
Critical
The inverter has de
tected a DC link low
voltage condition
.
Error occurs when DC link voltage drops below 14VDC. If condition is detected, out
door unit will stop (compressor and fan). Antishort cycle is initiated. If condition occurs
10 times within an hour, system will lock out.
Indicates power interruption, brownout, poor electrical connection or loose inverter in
put wire.
To clear, disconnect power to outdoor unit and restart.
E 430 26 2 flashes 6 flashes
Moderate /
Critical
Compressor start
failure
.
If condition is detected, outdoor unit will stop (compressor and fan). Antishort cycle is
initiated. If condition occurs 10 times within an hour, system will lock out.
Indicates poor connection at compressor harness, improper winding resistance,
locked compressor rotor, or flooded compressor.
To clear, disconnect power to outdoor unit and restart.
E 431 27 2 flashes 7 flashes
Moderate /
Critical
The inverter has de
tected a PFC circuit
over-current condition.
Error occurs when PFC detects a over-current condition of 100A peak. If condition is
detected, outdoor unit will stop (compressor and fan). Antishort cycle is initiated. If
condition occurs 10 times within an hour, system will lock out.
Indicates high pressure, condenser fan failure, locked compressor rotor or over
charge.
To clear, disconnect power to outdoor unit and restart.
E 432 28 2 flashes 8 flashes
Moderate /
Critical
The inverter has de
tected a DC link high
voltage condition.
Error occurs when the DC link capacitor voltage is greater than 480VDC. If condition is
detected, outdoor unit will stop (compressor and fan). Antishort cycle is initiated. If
condition occurs 10 times within an hour, system will lock out. System will stop. To
clear, disconnect power to outdoor unit and restart.
E 433 29 2 flashes 9 flashes
Moderate /
Critical
The inverter has de
tected a compressor
over-current condi
tion.
Error occurs when compressor peak phase current is greater than 28A. Inverter will
issue code 14 first and slow down to try to reduce the current. If the current remains
high, outdoor unit will stop (compressor and fan). Antishort cycle is initiated. If condi
tion occurs 5 times within an hour, system will lock out. To clear disconnect power to
outdoor unit and restart.
E 434 53 5 flashes 3 flashes
Moderate /
Critical
Outdoor control has
lost communications
with the inverter for
greater than 3
minutes.
Error occurs when communication a checksum error occurs for 3 minutes. Outdoor
control stops all compressor demands. Recycle power to the inverter by deenergiz
ing the contactor for 2 minutes.
E 435 60 6 flashes OFF
Moderate /
Critical
Inverter internal er
ror.
When this error occurs, the outdoor control will cycle power to the inverter by opening
the contactor for 2 minutes. Check that the EEPROM is properly seated. After power is
cycled to the inverter 3 times, the outdoor unit is locked out.
E 436 62 6 flashes 2 flashes
Moderate /
Critical
Inverter heat sink
temperature ex
ceeded limit
.
Occurs when the heat sink temperature exceeds the inverter limit. Inverter issues
code 13 first, then slows down to allow the heat sink to cool. If temperature remains
high, outdoor unit stops (compressor and fan). Antishort cycle is initiated. If condition
occurs 5 times within an hour, system is locked out. To clear, disconnect power to out
door unit and restart.
E 437 65 6 flashes 5 flashes
Moderate /
Critical
Heat sink temperat
ure sensor fault has
occurred (temperat
ure less than 4 ºF or
greater than 264ºF
after 10 minutes of
operation).
This occurs when the temperature sensor detects a temperature less than 0.4ºF or
greater than 264ºF after 10 minutes of operation. If condition is detected, outdoor unit
will stop (compressor and fan). Antishort cycle is initiated. If condition occurs 5 times
within an hour, system will lock out. To clear disconnect power to outdoor unit and re
start. If problem persists, replace inverter.
E 438 73 7 flashes 3 flashes
Moderate /
Critical
The inverter has de
tected a PFC circuit
over-current condi
tion
.
Error occurs when PFC detects an input over-current condition of 35A peak. If condi
tion is detected, outdoor unit will stop (compressor and fan). Antishort cycle is initi
ated. If condition occurs 10 times within an hour, system will lock out.
Indicates high pressure, condenser fan failure, or locked compressor rotor.
To clear, disconnect power to outdoor unit and restart.
E 439 12 1 flash 2 flashes Moderate
Compressor slow
down due to high in
put current.
Input current is approaching a high limit. Compressor speed will automatically slow
down. The control continues sending the inverter speed demanded by the thermostat.
The control will set indoor CFM and outdoor RPM to values according to demand per
centage rather than the actual Hz. Alarm is automatically clear.
E 440 13 1 flash 3 flashes Moderate
Compressor slow
down due to high
heatsink temperat
ure.
Heat sink temperature is approaching limit. The compressor speed will automatically
slow down to reduce heatsink temperature. The control will set indoor CFM and out
door RPM to values according to demand percentage rather than the actual Hz. Alarm
is automatically cleared.
E 441 14 1 flash 4 flashes Moderate
Compressor slow
down due to high
compressor current.
Compressor current is approaching high limit. The compressor speed will automatic
ally slow down. The control will set indoor CFM and outdoor RPM to values according
to demand percentage rather than the actual Hz. Alarm is automatically cleared.