What It Means
- The liquid line temperature sensor has malfunctioned.
- Faulty outdoor liquid line sensor
Lennox Split & Multi-Split
Lennox Error Code E424
Split & Multi-Split
E424 means different things on different Split & Multi-Split models. Enter your model number to see only your reading, or find your model below.
Causes & actions from Lennox
The liquid line temperature sensor has malfunctioned.
40 models
EL18XCV, EL18XCV-024, EL18XCV-036, EL18XCV-048, EL18XCV-060, EL18XPV, EL18XPV-024, EL18XPV-036, EL18XPV-048, EL18XPV-060, EL19KPV, EL19KPV-024, EL19KPV-036, EL19KPV-048, EL19KPV-060, EL21KLV, EL21KLV-024, EL21KLV-036, EL21KLV-048, EL21KLV-060, EL22KCV, EL22KCV-024, EL22KCV-036, EL22KCV-048, EL22KCV-060, SL22KLV, SL22KLV-024, SL22KLV-036, SL22KLV-048, SL22KLV-060, SL25KCV, SL25KCV-024, SL25KCV-036, SL25KCV-048, SL25KCV-060, SL28XCV, SL28XCV-024, SL28XCV-036, SL28XCV-048, SL28XCV-060
Air conditioner (outdoor), Heat pump (outdoor)
How it shows
- Outdoor control 7-segment display: E424
Check connections between pin 3 and 4 of the four pin liquid/ suction temperature plug on the bottom left corner of the control. Check resistance of resistor. Nominal 10K Ohms at 77F. Error code occurs if sensor is open or shorted.
Applicable models & manual sources
- EL18XCV
The liquid line temperature sensor has malfunctioned.
EL18XCV, EL18XCV-024, EL18XCV-036, EL18XCV-048, EL18XCV-060
- EL18XPV
The liquid line temperature sensor has malfunctioned.
EL18XPV, EL18XPV-024, EL18XPV-036, EL18XPV-048, EL18XPV-060
- EL19KPV
The liquid line temperature sensor has malfunctioned.
EL19KPV, EL19KPV-024, EL19KPV-036, EL19KPV-048, EL19KPV-060
- EL21KLV
The liquid line temperature sensor has malfunctioned.
EL21KLV, EL21KLV-024, EL21KLV-036, EL21KLV-048, EL21KLV-060
- EL22KCV
The liquid line temperature sensor has malfunctioned.
EL22KCV, EL22KCV-024, EL22KCV-036, EL22KCV-048, EL22KCV-060
- SL22KLV
The liquid line temperature sensor has malfunctioned.
SL22KLV, SL22KLV-024, SL22KLV-036, SL22KLV-048, SL22KLV-060
- SL25KCV
The liquid line temperature sensor has malfunctioned.
SL25KCV, SL25KCV-024, SL25KCV-036, SL25KCV-048, SL25KCV-060
- SL28XCV
The liquid line temperature sensor has malfunctioned.
SL28XCV, SL28XCV-024, SL28XCV-036, SL28XCV-048, SL28XCV-060
Faulty outdoor liquid line sensor
10 models
EL18XCV, EL18XCV-024, EL18XCV-036, EL18XCV-048, EL18XCV-060, EL22KCV, EL22KCV-024, EL22KCV-036, EL22KCV-048, EL22KCV-060
How it shows
- Outdoor control 7-segment display: E424
Sensor is open or shorted. Replace the sensor.
Applicable models & manual sources
- EL18XCV
Faulty outdoor liquid line sensor
EL18XCV, EL18XCV-024, EL18XCV-036, EL18XCV-048, EL18XCV-060
- EL22KCV
Faulty outdoor liquid line sensor
EL22KCV, EL22KCV-024, EL22KCV-036, EL22KCV-048, EL22KCV-060
Disclaimer: This information is for general reference. Code wording and instructions vary by model. Always follow the service manual for your exact unit.
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