507607-03
Issue 1827
Page 16 of 23
Code
Diagnostic Codes / Status of Equipment
Action Required to Clear and Recover
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 R410A 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 HFC410A 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 HFC410A
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.
E416
The outdoor coil sensor is either open, short-circuited
or the temperature is out of sensor range. As a result,
the outdoor unit control will not perform any defrost
tempering.
Coil sensor being detected open or shorted, or temperature is
out of coil sensor range. Outdoor unit control will not perform
demand or time/temperature defrost operation. System will
still heat or cool. Check the resistance of the coil sensor and
compare to temperature resistance chart. Replace coil sensor
if needed. The alarm clears when outdoor unit control detects
proper coil sensor readings or after a power reset.
E417
The outdoor unit discharge sensor is either open, short-
circuited or the temperature is out of sensor range. As a
result, the outdoor unit control will not perform any defrost
tempering.
Outdoor unit control detects open or shorted discharge
sensor, or temperature that is out of discharge sensor range.
Check the resistance of the discharge sensor and compare
to temperature resistance chart; replace if needed. Reset
by replacing the discharge sensor. This fault is detected
by allowing the unit to run for 90 seconds before checking
discharge sensor resistance. If the discharge sensor
resistance is not within range after 90 seconds, the board will
count one fault. After 5 faults, the board will lock out. Check
for proper sensor reading and attachment to line. The alarm
clears after a power reset.
E418
There is a faulty W output circuit.
Faulty W output circuit. Confirm that the unit is not running.
Check for mis-wiring. Disconnect thermostat lines from W
and verify 24VAC on the W. If 24VAC is present, replace the
board.
E419
The W output on the outdoor unit has reported more
than 5 errors. As a result, the system has shut down the
outdoor unit.
W output hardware fault count reached 5 strikes.
NOTE
:
Additional codes may be found in the Comfort Sync room thermostat manual.
Table 5. 7-Segment Alert and System Status Codes
