507343-01
Page 56
Table 10. Alert Codes and Troubleshooting
Critical alerts are displayed on the Home screen, in the Home
owner alert button, and in the Installer alert button. Minor and
moderate alerts are found only in the Installer alert button.
Alert
Code
PRIORITY
CONDITION
APPLICABLE
SYSTEM
COMPONENTS
ALERT TEXT
COMPONENT OR SYSTEM OPERA
TIONAL STATE AND TROU
BLESHOOTING TIP
HOW TO CLEAR
ALERT CODE
400 Critical
Outdoor unit
The compressor internal over
load has tripped.
Thermostat demand Y1 is
present; however compressor is
not running.
Check power to unit.
This alert code is automatically
cleared after current is sensed in
both RUN and START sensors
for at least two seconds or after
service is removed, or after pow
er reset.
Automatically clears
when the system de
tects that the issue no
longer exists.
401 Moderate
Outdoor unit
Either the compressor ran for
more than 18 hours continu
ously trying to cool the home
during a single demand or the
refrigerant pressure in the sys
tem is low.
Alert code will not lockout system.
If the two-stage outdoor unit has:
An outdoor control with blinking
LED lights then the unit will run in
low speed;
An outdoor control with a 7-seg
ment display, the outdoor control
will display alert code 401, but
continue to run in high speed.
If the outdoor unit is a heat pump,
and the outdoor temperature is
less than 65°F, alert code 401 is
ignored.
Also monitors low pressure
switch trips.
Automatically clears
after 30 consecutive
normal run cycles or
power reset.
402 Critical
Outdoor unit
Either the discharge or suction
pressure level is out-of-limits,
or the compressor has over
loaded.
Check discharge or suction pressure.
Automatically clears
after four consecutive
normal compressor
run cycles.
403 Moderate
Outdoor unit
The compressor ran for less
than three minutes to satisfy a
thermostat demand.
This short cycle fault is triggered
when five compressor cycles last
ed less than four minutes. The
compressor cycles could have
ended for any reason, thermostat
satisfied or high-pressure switch
for example.
Automatically clears
after four consecutive
normal compressor
run cycles.
NOTE: Code removed
from outdoor control -
Part # 103369-03 and
later / Cat # 11H36
Kit).
404 Critical
Outdoor unit
The compressor rotor is locked
up.
Compressor rotor locked up due
to run capacitor short,
Bearings are seized
Excessive liquid refrigerant, etc.
(NOTE: May need to install hard
start kit).
Automatically clears
after four consecutive
normal run cycles or
after power reset.
405 Critical
Outdoor Unit
The compressor circuit is open.
Compressor circuit open (due to power
disconnection - open fuse, etc.)
Automatically clears
after one normal com
pressor run cycle.
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