Lennox SLP98UHV Installation Instructions Manual page 58

Integrated Control Diagnostic Codes
Code Diagnostic Codes/Status of Equipment
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.
E275 Soft lockout - Flame sensed out of sequence
from code 241 fault. Flame signal is gone.
E276 Soft lockout - Exceeded maximum number of
calibration retries.
E290 Ignitor circuit fault - Failed ignitor or triggering
circuitry.
E291 Restricted air flow - Cubic feet per minute is
lower than what is needed for minimum firing
rate.
E292 Indoor blower motor unable to start - Seized
bearings, stuck wheel, etc.
E294 Combustion air inducer motor amp draw is too
high.
E295 Indoor blower motor temperature is too high.
E310 Discharge error sensor failure - No error if
disconnected. Only shown if shorted or out-of-
range.
E311 Heat rate reduced to match indoor blower air
flow. Replace filter or repair duct restriction.
E312 Restricted air flow in cooling or continuous fan
mode is lower than cfm setting.
E313 Indoor or outdoor unit capacity mismatch.
E331 Global network connection - Communication
link problem.
E347 No 24 Volt output on Y1 to C with non-
communicating outdoor unit.
E348 No 24 Volt output on Y2 to C with non-
communicating outdoor unit.
E349 No 24 Volts between R & O with non-
communicating outdoor unit (Dual fuel module
required for heat pump application).
E401 LSOM - Compressor ran more than 18 hours
in air conditioning mode.
Action Required to Clear and Recover
See E 250.
See E 241.
See E 228.
See E 207.
Check for dirty filter, unit air flow restriction, blower performance.
Indoor blower motor unable to start (seized bearing, stuck wheel,
etc), replace motor or wheel if assembly does not operate or meet
performance.
Check combustion blower bearings, wiring , amperes, replace if it
does not operate or meet performance.
Indoor blower motor over temperature (motor tripped on internal
protector), Check motor bearings, amperes. Replace if necessary.
Discharge air temperature(DATS) out of range, code is activated
during "Field test mode".
Furnace blower in cutback mode due to restricted airflow. Check
filter and ductwork. To clear replace filter if needed or repair/ add
ductwork.
Restricted airflow - 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
filter and ductwork. To clear replace filter if needed or repair/ add
ductwork.
Incorrect Indoor /outdoor capacity code selected. Check for proper
configuration in installation instructions. Alarm is just a warning.
The system operation is not impacted at all and alarm would clear
when Commissioning is exited.
For Future Use.
Y1 relay / Stage 1 failed (Pilot relay contacts did not close or the
relay coil did not energize).
Y2 relay / Stage 2 failed (Pilot relay contacts did not close or the
relay coil did not energize).
Configuration link R to O needs to be cut on control board.
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.
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