506566−01 09/10
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Critical alerts are displayed on Home (user) screen, in the Homeowner alert tab, and in
the Installer alert tab. Minor and Moderate alerts are found only in the Installer alert tab.
Table 4. Alert Codes and
Troubleshooting
Alert ID Action required to Clear/RecoverPriorityMessage Name
350 (Air Handler) Electric Heat not
Configured
Critical Heat call with no configured or mis−configured electric heat. Check for
proper configuring under Configuring Electric Heat Stages in the air han-
dler installation instructions. Cleared after electrical heat detection is suc-
cessful.
351 (Air Handler) Electric Heat
Stage 1 Problem
Critical Heat section / Stage 1 failed. (Pilot relay contacts did not close, or the
relay coil in the electric heat section did not energize.) Air handler will op-
erate on 1
st
stage for reminder of the heat call. Will clear after fault recov-
ered.
352 (Air Handler) Electric Heat
Stage 2 Problem
Critical Heat section / Stage 2 failed (Same as Code 351).
353 (Air Handler) Electric Heat
Stage 3 Problem
Critical Heat section / Stage 3 failed (Same as Code 351).
354 (Air Handler) Electric Heat
Stage 4 Problem
Critical Heat section / Stage 4 failed (Same as Code 351).
355 (Air Handler) Electric Heat
Stage 5 Problem
Critical Heat section / Stage 5 failed (Same as Code 351).
400 (Outdoor Unit)
LSOM Compressor Long Run
Cycle
Moder-
ate
Compressor ran more than 18 hours to satisfy a single thermostat de-
mand. Critical Alert. Clears the error after 30 consecutive normal run
cycles or power reset.
401 (Outdoor Unit)
LSOM Compressor Short Cycle
Moder-
ate
Compressor runs less than 3 minutes to satisfy a thermostat demand.
Clears the error after 4 consecutive normal run cycles or power reset.
402 (Outdoor Unit)
LSOM Compressor Locked Ro-
tor
Critical Compressor rotor locked up due to run capacitor short, bearings are
seized, excessive liquid refrigerant, etc. Clears the error after 1 normal
compressor run cycle.
403 (Outdoor Unit)
LSOM Open Compressor circuit
Critical Compressor circuit open (due to power disconnection, open fuse, etc.)
Clears the error after 1 normal compressor run cycle.
404 (Outdoor Unit)
LSOM Open Compressor Start
Circuit
Critical Required amount of current is not passing through Start current transform-
er. Clears the error after 1 normal compressor run cycle.
405 (Outdoor Unit)
LSOM Open Compressor Run
Circuit
Critical Required amount of current is not passing through Run current transform-
er. Clears the error after 1 normal compressor run cycle.
406 (Outdoor Unit) Compressor con-
tactor welded
Critical Compressor runs continuously. Clears the error after 1 normal compressor
run cycle.
407 (Furnace / Air Handler/ Outdoor
Unit)
Low 24 VAC. Secondary voltage
is low.
Moder-
ate
After 10 minutes, operation is discontinued. Clears the code after voltage
is higher than 21 VAC for 2 seconds.
408 (Outdoor Unit)
LSOM System Pressure Trip
Critical Discharge or suction pressure out−of−limits, or compressor overloaded.
(Also checked by 409 and 411.) Clears the error after 4 consecutive nor-
mal compressor run cycles.
409 (Outdoor Unit)
LSOM Compressor Internal
Overload Tripped
Critical Thermostat demand Y1 is present; but, compressor is not running. Check
power to unit. Clears the error after 1 normal compressor run cycle.
410 (Outdoor Unit)
Open Low Pressure Switch
Moder-
ate
Unit pressures below the lower limit. System is shut down. Clears after
pressure switch closes.
411 (Outdoor Unit)
Low Pressure Switch Strikes
Lockout
Critical Open low pressure switch error count reached 5 strikes. Check system
charge using approach and subcooling temperatures. Reset by putting
outdoor unit control in test mode or resetting low voltage power.
412 (Outdoor Unit)
Open High Pressure Switch
Moder-
ate
Unit pressure is above the upper limit. System is shut down. Check sys-
tem operating pressures and compare to unit charging charts. Clears
when pressure switch closes.
413 (Outdoor Unit)
High Pressure Switch Strikes
Lockout
Critical Open high pressure switch error count reached 5 strikes. Check system
charge using approach and subcooling temperatures. Check outdoor fan
operation. Check for dirt or debris blocking air flow to outdoor unit. Reset
by putting outdoor unit control in test mode or resetting low voltage power.
414 (Outdoor Unit)
High Discharge Line Tempera-
ture
Moder-
ate
Discharge line temperature is > 279ºF. Check system operating pressures
and compare to unit charging charts in installation manual. Clears after
discharge temperature is < 225ºF.
table continued on next page
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