Lennox XC25-024-230-01 Installation And Service Procedure page 68

Table Table 18 continued
Inverter LED Flash
Code (number of
Alert Inverter
flashes)
Code
Codes
Red LED
E 427 21 2 flashes
E 428 22 2 flashes
E 429 23 2 flashes
E 430 26 2 flashes
E 431 27 2 flashes
E 432 28 2 flashes
E 433 29 2 flashes
E 434 53 5 flashes
E 435 60 6 flashes
E 436 62 6 flashes
E 437 65 6 flashes
E 438 73 7 flashes
E 439 12 1 flash
E 440 13 1 flash
E 441 14 1 flash
XC25
Priority Alarm Description
Green LED
The inverter has de­
Moderate /
1 flash tected a DC peak
Critical
fault condition
The inverter has de­
Moderate /
2 flashes tected a high main in­
Critical
put current condition
The inverter has de­
Moderate /
3 flashes tected a DC link low
Critical
voltage condition
Moderate /
Compressor start
6 flashes
Critical
The inverter has de­
Moderate /
7 flashes tected a PFC circuit
Critical
over-current condition.
The inverter has de­
Moderate /
8 flashes tected a DC link high
Critical
voltage condition.
The inverter has de­
Moderate / tected a compressor
9 flashes
Critical
over-current condi­
tion.
Outdoor control has
lost communications
Moderate /
3 flashes with the inverter for
Critical
greater
minutes.
Moderate / Inverter internal er­
OFF
Critical ror.
Inverter heat sink
Moderate /
2 flashes temperature
Critical
ceeded limit
Heat sink temperat­
ure sensor fault has
occurred (temperat­
Moderate /
5 flashes ure less than 4 ºF or
Critical
greater than 264ºF
after 10 minutes of
operation).
The inverter has de­
Moderate / tected a PFC circuit
3 flashes
Critical over-current condi­
tion .
Compressor
2 flashes Moderate down due to high in­
put current.
Compressor
down due to high
3 flashes Moderate
heat­sink temperat­
ure.
Compressor
4 flashes Moderate down due to high
compressor current.
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 over­
.
charge.
To clear, disconnect power to outdoor unit and restart.
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 outdoor unit and restart.
Error occurs when DC link voltage drops below 14VDC. If condition is detected, out­
door unit will stop (compressor and fan). Anti­short 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.
If condition is detected, outdoor unit will stop (compressor and fan). Anti­short cycle is
initiated. If condition occurs 10 times within an hour, system will lock out.
Indicates poor connection at compressor harness, improper winding resistance,
failure
.
locked compressor rotor, or flooded compressor.
To clear, disconnect power to outdoor unit and restart.
Error occurs when PFC detects a over-current condition of 100A peak. If condition is
detected, outdoor unit will stop (compressor and fan). Anti­short 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.
Error occurs when the DC link capacitor voltage is greater than 480VDC. If condition is
detected, outdoor unit will stop (compressor and fan). Anti­short 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.
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). Anti­short 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.
Error occurs when communication a check­sum error occurs for 3 minutes. Outdoor
control stops all compressor demands. Recycle power to the inverter by de­energiz­
than 3
ing the contactor for 2 minutes.
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.
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
ex­ high, outdoor unit stops (compressor and fan). Anti­short 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.
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). Anti­short 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.
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). Anti­short 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.
Input current is approaching a high limit. Compressor speed will automatically slow
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.
Heat sink temperature is approaching limit. The compressor speed will automatically
slow­
slow down to reduce heat­sink 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.
slow­ 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.
68
Possible Causes and Clearing Alarm