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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
E438 73 7 ashes 3 ashes
Moderate
/ Critical
The inverter has detected a
PFC over current condition.
This would be caused by a high
load condition, high pressure,
or outdoor fan failure. Outdoor
control will display the code
when the inverter has the error.
After 3 minutes, the inverter will
reset and the compressor will
turn on again. If it happens 10
times within a 60 minute rolling
time period, the OD control will
lock out operation of the outdoor
unit and display a critical code.
Issue:
Possible issue is system running at high pressures. Check for high
pressure trips or other alert codes in room thermostat and outdoor
control.
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.
E439 12 1 ash 2 ashes Minor
Compressor slowdown due to
high input current.
This error code is primarily for informational purposes as the
inverter controls the compressor to operate within design
parameters. Typically the inverter will make a minor speed
reduction of 4 Hz (approximately a 5-6% speed reduction) for a
brief period of time and to reduce the input current and will then
resume normal operation.
E440 13 1 ash 3 ashes Minor
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 according to
demand percentage rather
than the actual Hz. Alarm is
automatically cleared.
This error code is primarily for informational purposes as the
inverter controls the compressor speed to operate within design
parameters. Typically the inverter will make a minor speed
reduction of 4 Hz (approximately a 5-6% speed reduction) for
a brief period of time and to reduce the heat sink temperature
and will then resume normal operation. This may occur at high
outdoor temperatures (above 110ºF) for brief periods of time (3 – 4
minutes) and is normal and expected operation of the inverter
controlling the compressor safely within design parameters.
The inverter nned aluminum heat sink is located on the back side
of the inverter in the condenser air stream. f the alert code 440
occur frequently, especially at lower outdoor temperatures, check
the heat sink for debris that may reduce heat transfer or possible
obstructions that may impact air ow across the heat sink.
The inverter will begin to briey reduce the compressor speed
when the heat sink temperature rises above 185ºF and will
allow the inverter to resume the requested compressor demand
speed once the inverter heat sink reaches 176ºF. The heat
sink temperature, compressor speed in Hertz and the Inverter
Compressor Speed Reduction status (“On” or “O ”) notication
can be viewed under the outdoor unit Diagnostics section of the
thermostat dealer control center on units installed with an S30
thermostat.
E441 14 1 ash 4 ashes Minor
Compressor slowdown
due to high compressor
current. Compressor
current is approaching limit.
The compressor speed
automatically slows. The control
sets indoor CFM and outdoor
RPM to values according to
demand percentage rather
than the actual Hz. Alarm is
automatically cleared.
This error code is primarily for informational purposes as the
inverter controls the compressor to operate within design
parameters. Alert code 441 typically occurs at startup as the
compressor as the currently increases rapidly during startup.
The inverter will reduce the compressor speed by 4 hz and slow
the compressor ramp up speed to the requested compressor
demand (capacity). This is normal and expected operation of the
inverter to control the compressor within design parameters. In
most cases the alert code 441 does not require any additional
service or diagnostic procedures.
E441 may also occur if the system is operating at high pressures.
E442 N/A N/A N/A Critical
The top cap switch has opened
ve times within one hour. As a
result, the outdoor unit is locked
out.
When compressor thermal protection sensor opens ve times
within one hour, outdoor stops working.
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.
E443 N/A N/A N/A Critical
Incorrect appliance unit size
code selected.
Check for proper conguring of unit size codes for outdoor unit
in conguration 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.
E600 N/A N/A N/A Minor
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 outdoor
unit. The feature is activated by applying 24 volts AC power to the
L and C terminals on the outdoor control.
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