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TABLE 7. 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/dehumidi-
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.
Alert
Codes
Inverter
Code
Inverter LED Flash Code
(number of ashes)
Priority Alarm Description Possible Causes and Clearing Alarm
Red LED Green LED
E426 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 system
setup. Check condenser fan motor, TXV, indoor unit blower motor,
over-charge, undercharge, or clogged refrigerant lter.
To clear, disconnect power to the indoor unit (24VAC power source
to the outdoor control) which will power o 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 toward this lock out condition.
E427 21 2 ashes 1 ash
Moderate
/ Critical
The inverter has detected a DC peak fault condition. If condition (55A or higher) is detected, outdoor
unit compressor and fan stop. Anti-short 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
compressor rotor or overcharge. To clear, disconnect power to the indoor unit (24VAC power
source to the outdoor control) which will power o the outdoor control and will open the outdoor unit
contactor, which interrupts power to the inverter and then re-apply power..
E428 22 2 ashes 2 ashes
Moderate
/ Critical
The inverter has detected a high
main input current condition.
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 the indoor unit (24VAC power source
to the outdoor control) which will power o the outdoor control and
will open the outdoor unit contactor, which interrupts power to the
inverter and then re-apply power.
E429 23 2 ashes 3 ashes
Moderate
/ Critical
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. If condition
is detected, 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.
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.
E430 26 2 ashes 6 ashes
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 ooded
compressor.
To clear, disconnect power to the indoor unit (24VAC power source
to the outdoor control) which will power o the outdoor control and
will open the outdoor unit contactor, which interrupts power to the
inverter and then re-apply power.
E431 27 2 ashes 7 ashes
Moderate
/ Critical
Error occurs when PFC detects
an over-current condition of
100A, the control will display a
moderate code. If condition is
detected, outdoor unit will stop
(Compressor and fan). Anti-
short cycle is initiated. Inverter
is unavailable to communicate
with the outdoor control for 3
minutes. If condition occurs 10
times within a 60 minute rolling
time period, system will lock out
and display a critical code.
Issues:
(1) Indicates power interruption, brownout, poor electrical
connection or loose inverter input wire.
(2) System testing was set up and code was generated when the
reversing valve is de-energized coming out of defrost (code
appears with or without 30 compressor delay).
Corrective Actions:
(1) Check for proper main power to outdoor unit and for any loose
electrical connections.
(2) To clear, disconnect power to the indoor unit (24VAC power
source to the outdoor control) which will power o the outdoor
control and will open the outdoor unit contactor, which
interrupts power to the inverter and then re-apply power.
E432 28 2 ashes 8 ashes
Moderate
/ Critical
The inverter has detected 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. Anti-short cycle is initiated. If condition occurs 10 times within
an hour, system is locked out. System stops.
To clear, disconnect power to the indoor unit (24VAC power source
to the outdoor control) which will power o the outdoor control and
will open the outdoor unit contactor, which interrupts power to the
inverter and then re-apply power.
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