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506920−01 09/12
Page 52
Critical alerts are displayed on Home (user) screen, in the Homeowner alert button, and in the Installer
alert button. Minor and Moderate alerts are found only in the Installer alert button.
Table 5. Alert Codes and Troubleshooting
Alert
Code
Steps to clearAlert TextPriority
354 Critical (Air Handler) There is a problem with the air−
handler’s 4th stage electric heat. Either the pilot
relay contacts did not close, or the relay coil in
the electric heat section did not energize. The
air−handler will operate on 1st stage electric
heat until the issue is resolved.
Heat section / Stage 4 failed (Same as Code 351).
355 Critical (Air Handler) There is a problem with the air−
handler’s 5th stage electric heat. Either the pilot
relay contacts did not close, or the relay coil in
the electric heat section did not energize. The
air−handler will operate on 1st stage electric
heat until the issue is resolved.
Heat section / Stage 5 failed (Same as Code 351).
370 Critical (Furnace) The furnace control board has not
received 24VAC power for 2 minutes or more.
Control sees the loss of 24VAC for 2 minutes .Terminate all services and wait for interlock switch to
close. The alarm will clear when 24VAC is continuously sensed on DS terminal for a minimum of 10
seconds or on a power reset. If 2 stage with float switch, the IFC control R−DS is open.
400 Critical (Outdoor Unit) The compressor internal over-
load has tripped.
Thermostat demand Y1 is present; but, compressor is not running. Check power to unit. Clears the
error after current is sensed in both RUN and START sensors for at least 2 seconds, or after service
is removed, or after power reset.
401 Moderate (Outdoor Unit) Either the compressor ran for
more than 18 hours continuously trying to cool
the home or the refrigerant pressure in the sys-
tem is low.
Compressor ran more than 18 hours to satisfy a single thermostat demand. Will not lockout system.
if 2 stage, units with blinking LED light controls, unit will run in low speed; units with 7−segment
display will display code, but continue to run in high speed. If a Heat Pump, and if outdoor temp is
less than 65 degrees, code is ignored. Clears the error after 30 consecutive normal run cycles or
power reset. Also monitors low pressure switch trips.
402 Critical (Outdoor Unit) Either the discharge or suction
pressure level is out−of−limits, or the is compres-
sor overloaded.
Discharge or suction pressure out−of−limits, or compressor overloaded. Clears the error after 4 con-
secutive normal compressor run cycles.
403 Moderate (Outdoor Unit) The compressor ran for less than
3 minutes to satisfy a thermostat demand.
Compressor runs less than 3 minutes to satisfy a thermostat demand. Clears the
error after 4 consecutive normal run cycles or power reset.
404 Critical (Outdoor Unit) The compressor rotor is locked
up. This could be due to a short circuiting of the
run capacitor, seizing of the bearings or exces-
sive liquid refrigerant etc.
Compressor rotor locked up due to run capacitor short, bearings are seized, excessive liquid refriger-
ant, etc. (NOTE: May need to install hard start kit). Clears the error after 4 consecutive normal run
cycles or after power reset.
405 Critical (Outdoor Unit) The compressor circuit is open.
This could be due to a power disconnection,
open fuse etc.
Compressor circuit open (due to power disconnection, open fuse, etc.) Clears the
error after 1 normal compressor run cycle.
406 Critical (Outdoor Unit) The required amount of current is
not passing through the start current transform-
er.
Required amount of current is not passing through Start current transformer. Clears the error after
current is sensed in START sensor, or after power reset.
table continued on next page