Lennox XC25-024-230-01, Installation And Service Procedure, Page: 32 / 72

32
XC25
Table 6 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 425 N/A N/A N/A Minor
Outdoor control has
increased minimum
compressor speed
to allow for proper oil
return due to low
ambient temperat­
ure.
Outdoor ambient temperature is below system limit. Control at­
tempts to run at lowest allowed compressor speed to allow for
proper oil return. Automatically clears when outdoor ambient
temperature rises above limit for more than 5 minutes.
E 426 N/A N/A N/A Critical
Excessive inverter
alarms
After ten faults within one hour, control is locked out, indicating
poor system operation. Review history of alarms to resolve sys­
tem setup. Check condenser fan motor, TXV, indoor unit blower
motor, over-charge, undercharge, or clogged refrigerant filter.
To clear error, disconnect power to outdoor unit and restart. In­
verter alarms 12 to 14 and 53 do not count toward this lock out
condition.
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 compressor
and fan stop. Anti­short cycle is initiated. If peak current (55A or
higher) occurs 10 times within an hour, system is locked out.
Indicates high pressure, condenser fan failure, locked com­
pressor rotor or overcharge.
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
input current condi­
tion
.
If condition is detected, is detected, outdoor unit compressor and
fan stop. Anti­short cycle is initiated. If condition occurs 5 times
within an hour, system is locked 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 condi­
tion is detected, outdoor unit compressor and fan stop. Anti­short
cycle is initiated. If condition occurs 10 times within an hour, sys­
tem is locked out.
Indicates power interruption, brownout, poor electrical connec­
tion or loose inverter input 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 compressor and fan stop.
Anti­short cycle is initiated. If condition occurs 10 times within an
hour, system is locked out.
Indicates poor connection at compressor harness, improper
winding resistance, locked compressor rotor, or flooded com­
pressor.
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 condi­
tion
.
Error occurs when PFC detects a over-current condition of 100A
peak. If condition is detected, outdoor unit compressor and fan
stop. Anti­short cycle is initiated. If condition occurs 10 times
within an hour, system is locked out.
Indicates high pressure, condenser fan failure, locked com­
pressor rotor or overcharge.
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 compressor and
fan stop. Anti­short cycle is initiated. If condition occurs 10 times
within an hour, system is locked out. System stops. To clear, dis­
connect 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 issues code 14 first and slows down to try to
reduce the current. If the current remains high, outdoor unit com­
pressor and fan stop. Anti­short cycle is initiated. If condition oc­
curs 5 times within an hour, system is locked out. To clear discon­
nect power to outdoor unit and restart.
E 434 53 5 flashes 3 flashes
Moderate /
Critical
Outdoor control has
lost communica­
tions with the invert­
er for greater than 3
minutes.
Error occurs when communication a check­sum error occurs for
3 minutes. Outdoor control stops all compressor demands. Re­
cycle power to the inverter by de­energizing the contactor for 2
minutes.