Lennox XC25-060-230-01 - Page 33

33
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 435 60 6 flashes OFF
Moderate /
Critical
Inverter internal er
ror.
When this error occurs, the outdoor control cycles 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 outdoor 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)
.
Occurs when the temperature sensor detects a temperature
less than 0.4ºF or greater than 264ºF after 10 minutes of op
eration. If condition is detected, outdoor unit will stop (com
pressor and fan). Antishort cycle is initiated. If condition oc
curs 5 times within an hour, system will lock out. To clear dis
connect power to outdoor unit and restart. 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
.
Occurs when PFC detects an input over-current condition of
35A peak. If condition is detected, outdoor unit will stop (com
pressor and fan). Antishort cycle is initiated. If condition oc
curs 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
automatically slows. The control continues sending the in
verter speed demanded by the thermostat. The control sets
indoor CFM and outdoor RPM to values according to demand
percentage rather than the actual Hz. Alarm is automatically
cleared.
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 automatically slows to reduce heatsink temperature.
The control sets indoor CFM and outdoor RPM to values ac
cording 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 com
pressor speed automatically slows. The control will set in
door CFM and outdoor RPM to values according to demand
percentage rather than the actual Hz. Alarm is automatically
cleared.
E 442 N/A N/A N/A Critical
The top cap switch
has opened 5 times
within one hour. As a
result, the outdoor
unit is locked out
.
When compressor thermal protection sensor opens 5 times
within 1 hour, outdoor stops working. To clear, disconnect
power to outdoor unit and restart.
E 443 N/A N/A N/A Critical
Incorrect appliance
unit size code selec
ted.
Check for proper configuring of unit size codes for outdoor
unit in configuration guide or in installation instructions. If
replacing inverter, verify inverter model matches unit size.
The alarm/fault clears after the correct match is detected
following a reset. Remove the thermostat from the system
while applying power and reprogramming.
E 600 N/A N/A N/A Critical
Compressor has
been cycled OFF on
utility load shedding.
Load shedding function: Provides a method for a local utility
company to limit the maximum power level usage of the out
door unit. The feature is activated by applying 24 volts AC
power to the L and C terminals on the outdoor control.
E 601 N/A N/A N/A Critical
Outdoor unit has
been cycled OFF on
low temperature
protection.
Low temperature protection: Outdoor unit will not operate
when the outdoor temperature is at or below 4°F (20°C). If
the unit is operating and the outdoor temperature drops be
low 4°F (20°C), the unit continues to operate until the room
thermostat is satisfied or the outdoor temperature drops to
15°F (26°C). Outdoor unit ambient sensor provides tem
perature readings.