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XP25
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
®
thermostat.
Alert
Codes
Inverter
Code
Inverter LED Flash
Code (number of
flashes)
Priority
Alarm Description
Possible Causes and Clearing Alarm
Red LED
Green LED
E 440
13
1 flash
3 flashes
Moderate
Heat sink temperature is
approaching limit. The
compressor speed auto
matically slows to reduce
heat sink temperature. The
control sets indoor CFM
and outdoor RPM to values
according to demand per
centage rather than the ac
tual Hz. Alarm is automatic
ally cleared.
Issue
: Feedback from supplier tear down of inverter in
dicates that the screws that hold the inverter to the invert
er board were loose causing poor contact between these
two components.
Corrective action
: Tighten screws that hold the heat sink
to the inverter control board.
NOTE
: Wait 5 minutes to all capacitor to discharge before
checking screws.
E 441
14
1 flash
4 flashes
Moderate
Compressor slowdown due
to high compressor current.
Compressor current is ap
proaching limit. The com
pressor speed automatic
ally slows. The control sets
indoor CFM and outdoor
RPM to values according to
demand percentage rather
than the actual Hz. Alarm is
automatically cleared..
Issue
: Possible issue is system running at high pres
sures. Check for high pressure trips or other alert codes in
room thermostat and outdoor control.
E 442
N/A
N/A
N/A
Critical
The top cap switch has
opened five times within
one hour. As a result, the
outdoor unit is locked out
.
When compressor thermal protection sensor opens five
times within one 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 selected.
Check for proper configuring of unit size codes for out
door unit in configuration guide or in installation instruc
tions. If replacing inverter, verify inverter model
matches unit size. The alarm/fault clears after the cor
rect 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 outdoor 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 temper
ature 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 temper
ature drops below 4°F (20°C), the unit continues to op
erate until the room thermostat is satisfied or the outdoor
temperature drops to 15°F (26°C). Outdoor unit ambi
ent sensor provides temperature readings.
