Lennox XC20-036-230-01 Installation And Service Procedure page 33

Table 6. 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/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 iComfort Wi-Fi
Inverter LED Flash
Code (number of
Alert Inverter
flashes)
Code
Codes
Red LED
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
®
thermostat.
Priority Alarm Description
Green LED
Moderate /
6 flashes Compressor start failure
Critical
Error occurs when PFC de­
tects an over-current condi­
tion of 100A, the control will
display a moderate code. If
condition is detected, out­
door unit will stop (Com­
pressor and fan). Anti-short
Moderate /
7 flashes cycle is initiated. Inverter is
Critical
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 crit­
ical code.
The inverter has detected a
Moderate
DC link high voltage condi­
8 flashes
/ Critical
tion.
The inverter has detected a
Moderate
compressor
9 flashes
/ Critical
condition
Outdoor control has lost
communications with the
inverter for greater than 3
minutes. Outdoor control
will stop all compressor de­
mands, recycle power to
Moderate /
3 flashes the inverter by de-energiz­
Critical
ing the contactor for 2
minutes. If this occurs 3
time in one thermostat call,
the outdoor unit will locked
out and display a critical
code.
Moderate /
OFF Inverter internal error.
Critical
Possible Causes and Clearing Alarm
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, im­
.
proper winding resistance, locked compressor rotor, or
flooded compressor.
To clear, disconnect power to outdoor unit and restart.
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) Outdoor control boards with part # 103686-03 have
software update to delay the de-energizing of the revers­
ing valve by four seconds when coming out of defrost.
Error occurs when the DC link capacitor voltage is greater
than 480VDC. If condition is detected, outdoor unit com­
pressor and fan stop. Anti­short cycle is initiated. If condi­
tion occurs 10 times within an hour, system is locked out.
System stops. To clear, disconnect power to outdoor unit
and restart.
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
over-current high, outdoor unit compressor and fan stop. Anti­short
cycle is initiated. If condition occurs five times within an
.
hour, system is locked out. To clear disconnect power to
outdoor unit and restart.
Issues:
(1) Loose electrical connections.
(2) Interruption of main power to inverter.
Corrective Actions:
(1) Check all electrical connections.
(2) Check for proper main power to inverter.
When this error occurs, the outdoor control cycles power
to the inverter by opening the contactor for two minutes.
Check that the EEPROM is properly seated. After power
is cycled to the inverter 3 times, the outdoor unit is locked
out
.
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XC20