506860-03
Issue 1946
Page 18 of 27
Code
Diagnostic Codes / Status of Equipment
Action Required to Clear and Recover
E180
Outdoor air temperature sensor failure. Only shown if
shorted or out of range (Communicating systems only)
Compare outdoor sensor resistance to temperature
resistance charts in unit installation instructions. Replace
sensor pack if necessary. At beginning of (any) configuration,
furnace or air handler control will sense outdoor air and
discharge air temperature sensor(s) If detected (reading
in range), appropriate feature will be set as installed and
that could be seen in 'About ' screen. In normal operation
after control recognizes sensors, alarm will be sent if valid
temperature reading is lost. To get rid of setting and alarm,
redo configuration and make sure that temperature sensor is
marked as not installed in indoor Unit ‘About’ screen. When
indoor unit control is replaced thermostat will ‘tell’ new control
if temperature sensor is in system or not. Clears 30 seconds
after fault recovered.
E409
LSOM - Compressor low voltage.
Secondary voltages below 18VAC. After 10 minutes, operation
is discontinued. Clears the code after voltage is higher than
20VAC for 2 seconds or after power reset.
E410
The outdoor unit pressure is below the required limit.
Unit pressure is below the lower limit. The system is shut
down. The low pressure switch for R-410A will open at 40
PSIG and close at 90 PSIG. Confirm that the system is
properly charged with refrigerant. Check TXV, indoor unit
blower motor, dirty filters or clogged refrigerant filter. Confirm
that the evaporator coil is clean. The alarm clears after the
pressure switch closes or after a power rest.
E411
The low pressure switch has opened 5 times during one
cooling cycle. As a result, the system will shut down.
Open low pressure switch error count reached 5 strikes. The
low pressure switch for R-410A will open at 40 PSIG and
close at 90 PSIG. Confirm that the system is properly charged
with refrigerant. Check TXV, indoor unit blower motor, dirty
filters or clogged refrigerant filter. Confirm that the evaporator
coil is clean. The alarm clears after a power rest.
E412
The outdoor unit pressure is above the required limit. The
system will shut down.
Unit pressure is above the upper limit. System is shut down.
The high pressure switch for R-410A will open at 590 PSIG
and close at 418 PSIG. Confirm that the system is properly
charged with refrigerant. Check condenser fan motor, TXV,
indoor unit blower motor, stuck reversing valve or clogged
refrigerant filter. Confirm that the outdoor unit is clean. The
alarm clears after 4 consecutive normal compressor run
cycles, the pressure switch closes or a power reset.
E413
The high pressure switch has opened 5 times during one
cooling cycle. As a result, the Comfort Sync thermostat
will shut down.
Open high pressure switch error count reached 5 strikes.
System is shut down. The high pressure switch for R-410A will
open at 590 PSIG and close at 418 PSIG. Confirm that the
system is properly charged with refrigerant. Check condenser
fan motor, TXV, indoor unit blower motor, stuck reversing
valve or clogged refrigerant filter. Confirm that the outdoor unit
is clean. The alarm clears after a power reset.
E414
The discharge line temperature is higher than the
recommended upper limit of 279°F.
Discharge line temperature is > 279°F. Confirm that the
system is properly charged with refrigerant. Check system
operating pressures and compare to unit charging charts in
installation manual. Confirm that the outdoor unit is clean. The
alarm clears after the discharge temperature is < 225°F.
E415
The discharge line temperature has been consistently
higher than the recommended upper limit of 279°F.
Discharge line high temperature error count reached 5
strikes. Confirm that the system is properly charged with
refrigerant. Check system operating pressures and compare
to unit charging charts in installation manual. Confirm that the
outdoor unit is clean. The alarm clears after the discharge
temperature is < 225°F. The alarm clears after a power reset.
NOTE
:
Additional codes may be found in the Comfort Sync room thermostat manual.
Table 5. 7-Segment Alert and System Status Codes
