Lennox Split & Multi-Split Error Code E410

SL25KCV, SL25KCV-024, SL25KCV-036, SL25KCV-048, SL25KCV-060, SL28XCV, SL28XCV-024, SL28XCV-036, SL28XCV-048, SL28XCV-060

Unit pressure is below the lower limit. The system is shut down. The cut-out is set at 25 PSIG and the cut-in set at 40 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 rises above 40 PSIG.

SL22KLV, SL22KLV-024, SL22KLV-036, SL22KLV-048, SL22KLV-060

Unit pressure is below the lower limit. The system is shut down. The cut-out is set at 35 PSIG and the cut-in set at 80 PSIG. SL22KLV does not have a Low Pressure switch, the low pressure switch is emulated by the suction pressure transducer. 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. Confirm the suction pressure transducer is providing the correct suction pressure reading compared to manifold gauge pressure, if not check pressure tranducer connections. The alarm clears after the pressure rises above 80 PSIG.

EL21KLV, EL21KLV-024, EL21KLV-036, EL21KLV-048, EL21KLV-060

Unit pressure is below the lower limit. The system is shut down. The suction pressure transducer emulates a low pressure switch, the unit does not have a low pressure switch. The cut-out is set at 35 PSIG and the cut-in set at 80 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 rises above 80 PSIG.

EL19KPV, EL19KPV-024, EL19KPV-036, EL19KPV-048, EL19KPV-060

Unit pressure is below the lower limit. The system is shut down. The suction pressure transducer emulates a low pressure switch, the unit does not have a low pressure switch. The cut-out is set at 35 PSIG and the cut-in set at 80 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 rises above 90 PSIG.

EL19KPV, EL19KPV-024, EL19KPV-036, EL19KPV-048, EL19KPV-060

Unit pressure is below the lower limit. The system is shutdown. The low pressure switch closes above 80PSIG and opens below 35PSIG. 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 opens or after a power reset.