Lennox SLP98UHV Installation Instructions Manual page 57

Integrated Control Diagnostic Codes (continued)
Code
Indoor blower motor temperature is too high.
E 295
E 310 Discharge error sensor failure - No error if disconnected. Only shown if
shorted or out-of-range.
E 311 Heat rate reduced to match indoor blower air flow. Replace filter or repair
duct restriction.
Restricted air flow in cooling or continuous fan mode is lower than cfm
E 312
setting.
Indoor or outdoor unit capacity mismatch.
E 313
E 331 Global network connection - Communication link problem.
No 24 Volt output on Y1 to C with non-communicating outdoor unit.
E 347
No 24 Volt output on Y2 to C with non-communicating outdoor unit.
E 348
No 24 Volts between R & O with non-communicating outdoor unit (Dual
E 349
fuel module required for heat pump application).
LSOM - Compressor ran more than 18 hours in air conditioning mode.
E 401
E 402 LSOM - Outdoor unit system pressure trip.
E 403 LSOM - Compressor short-cycling (Running less than 4 minutes).
E 404 LSOM - Compressor rotor locked.
E 405 LSOM - Compressor open circuit.
E 406 LSOM - Compressor open start circuit.
LSOM - Compressor open run circuit.
E 407
LSOM - Compressor contactor is welded.
E 408
E 409 LSOM - Compressor low voltage.
Diagnostic Codes/Status of Equipment
Indoor blower motor over temperature (motor
tripped on internal protector), Check motor bear­
ings, 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 re­
place filter if needed or repair/ add ductwork.
Incorrect Indoor /outdoor capacity code selected.
Check for proper configuration in installation instruc­
tions. 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. Out­
door unit power disconnect is open , compressor
circuit breaker or fuse(s) is open, broken wire or
connector is not making contact. Low or high pres­
sure switch open if present in the system. Compres­
sor contactor has failed to close.
Compressor ran over 18 hours in air conditioning
mode.
Outdoor unit pressure trip. Check dirty coil, fan mo­
tor, refrigerant charge.
Compressor short cycling (Running less than 4 min­
utes).
Check capacitor, wiring, hard start kit , replace com­
pressor.
Check compressor for hot (cool down) , check pres­
sures, fan motor etc. Replace compressor if unable
to get circuit to close and compressor to operate.
Replace contactor.
Page 57
Action Required to Clear and Recover