Lennox SIGNATURE SLP99UH090XV36C - Page 61

Page 61
Integrated Control Diagnostic Codes
Code Diagnostic Codes/Status of Equipment Action Required to Clear and Recover
E274 Soft lockout - Exceeded maximum number of
recycles. Last recycle failed due to the limit
circuit opening or limit remained open longer
than 3 minutes.
See E 250.
E275 Soft lockout - Flame sensed out of sequence
from code 241 fault. Flame signal is gone.
See E 241.
E276 Soft lockout - Exceeded maximum number of
calibration retries.
See E 228.
E290 Ignitor circuit fault - Failed ignitor or triggering
circuitry.
See E 207.
E291 Restricted air ow - Cubic feet per minute is
lower than what is needed for minimum ring
rate.
Check for dirty lter, unit air ow restriction, blower performance.
E292 Indoor blower motor unable to start - Seized
bearings, stuck wheel, etc.
Indoor blower motor unable to start (seized bearing, stuck wheel,
etc), replace motor or wheel if assembly does not operate or meet
performance.
E294 Combustion air inducer motor amp draw is too
high.
Check combustion blower bearings, wiring , amperes, replace if it
does not operate or meet performance.
E295 Indoor blower motor temperature is too high. Indoor blower motor over temperature (motor tripped on internal
protector), Check motor bearings, amperes. Replace if necessary.
E310 Discharge error sensor failure - No error if
disconnected. Only shown if shorted or out-of-
range.
Discharge air temperature(DATS) out of range, code is activated
during ”Field test mode”.
E311 Heat rate reduced to match indoor blower air
ow. Replace lter or repair duct restriction.
Furnace blower in cutback mode due to restricted airow. Check
lter and ductwork. To clear replace lter if needed or repair/ add
ductwork.
E312 Restricted air ow in cooling or continuous fan
mode is lower than cfm setting.
Restricted airow - Indoor blower is running at a reduced cubic
feet per minute (Cutback Mode) - The variable speed motor
has pre-set speed and torque limiters to protect the motor from
damage caused by operating out of its designed parameters (0
to 0.8 inches water column total external static pressure). Check
lter and ductwork. To clear replace lter if needed or repair/ add
ductwork.
E313 Indoor or outdoor unit capacity mismatch. Incorrect Indoor /outdoor capacity code selected. Check for proper
conguration in installation instructions. Alarm is just a warning.
The system operation is not impacted at all and alarm would clear
when Commissioning is exited.
E331 Global network connection - Communication
link problem.
For Future Use.
E347 No 24 Volt output on Y1 to C with non-
communicating outdoor unit.
Y1 relay / Stage 1 failed (Pilot relay contacts did not close or the
relay coil did not energize).
E348 No 24 Volt output on Y2 to C with non-
communicating outdoor unit.
Y2 relay / Stage 2 failed (Pilot relay contacts did not close or the
relay coil did not energize).
E349 No 24 Volts between R & O with non-
communicating outdoor unit (Dual fuel module
required for heat pump application).
Only applicable in non-communicating mode. The O to R link on
the furnace has been cut and could possibly cause a brown out.
Might also result in low voltage to which would generate alert code
as well. Conguration link R to O needs to be restored. Will need
to restore link by hard-wiring the R to O terminals on the terminal
strip.
E401 LSOM - Compressor ran more than 18 hours
in air conditioning mode.
Compressor protector is open. Check for high head pressure,
check compressor supply voltage. Outdoor unit power disconnect
is open , compressor circuit breaker or fuse(s) is open, broken wire
or connector is not making contact. Low or high pressure switch
open if present in the system. Compressor contactor has failed to
close.