What It Means
- The inverter has detected a circuit problem.
Lennox Split & Multi-Split
Lennox Error Code E423
Split & Multi-Split: Air conditioner (outdoor), Heat pump (outdoor)
Causes & actions from Lennox
How it shows
- Inverter code: 40
- Inverter LED flash code: Red 4 flashes, Green OFF (green: off, red: flashing ×4)
- Outdoor control 7-segment display: E423
Control locks out after 10 strikes within an hour. To clear, disconnect power to the indoor unit (24VAC power source to the outdoor control) which will power off the outdoor control and will open the outdoor unit contactor, which interrupts power to the inverter and then re-apply power.
Other manual wording
EL18XCV, EL18XCV-024, EL18XCV-036, EL18XCV-048, EL18XCV-060, EL18XPV, EL18XPV-024, EL18XPV-036, EL18XPV-048, EL18XPV-060, EL19KPV,…
Control will lock out after 10 strikes within an hour. To clear, disconnect power to the indoor unit (24VAC power source to the outdoor control) which will power off the outdoor control and will open the outdoor unit contactor, which interrupts power to the inverter and then re-apply power.
Applicable models & manual sources
- EL18XCV
The inverter has detected a circuit problem.
EL18XCV, EL18XCV-024, EL18XCV-036, EL18XCV-048, EL18XCV-060
- EL18XPV
The inverter has detected a circuit problem.
EL18XPV, EL18XPV-024, EL18XPV-036, EL18XPV-048, EL18XPV-060
- EL19KPV
The inverter has detected a circuit problem.
EL19KPV, EL19KPV-024, EL19KPV-036, EL19KPV-048, EL19KPV-060
- EL21KLV
The inverter has detected a circuit problem.
EL21KLV, EL21KLV-024, EL21KLV-036, EL21KLV-048, EL21KLV-060
- EL22KCV
The inverter has detected a circuit problem.
EL22KCV, EL22KCV-024, EL22KCV-036, EL22KCV-048, EL22KCV-060
- SL22KLV
The inverter has detected a circuit problem.
SL22KLV, SL22KLV-024, SL22KLV-036, SL22KLV-048, SL22KLV-060
- SL25KCV
The inverter has detected a circuit problem.
SL25KCV, SL25KCV-024, SL25KCV-036, SL25KCV-048, SL25KCV-060
- SL28XCV
The inverter has detected a circuit problem.
SL28XCV, SL28XCV-024, SL28XCV-036, SL28XCV-048, SL28XCV-060
- EL18XCV
The inverter has detected a circuit problem.
EL18XCV, EL18XCV-024, EL18XCV-036, EL18XCV-048, EL18XCV-060
- EL18XPV
The inverter has detected a circuit problem.
EL18XPV, EL18XPV-024, EL18XPV-036, EL18XPV-048, EL18XPV-060
- EL19KPV
The inverter has detected a circuit problem.
EL19KPV, EL19KPV-024, EL19KPV-036, EL19KPV-048, EL19KPV-060
- EL21KLV
The inverter has detected a circuit problem.
EL21KLV, EL21KLV-024, EL21KLV-036, EL21KLV-048, EL21KLV-060
- EL22KCV
The inverter has detected a circuit problem.
EL22KCV, EL22KCV-024, EL22KCV-036, EL22KCV-048, EL22KCV-060
- SL22KLV
The inverter has detected a circuit problem.
SL22KLV, SL22KLV-024, SL22KLV-036, SL22KLV-048, SL22KLV-060
- SL25KCV
The inverter has detected a circuit problem.
SL25KCV, SL25KCV-024, SL25KCV-036, SL25KCV-048, SL25KCV-060
- SL28XCV
The inverter has detected a circuit problem.
SL28XCV, SL28XCV-024, SL28XCV-036, SL28XCV-048, SL28XCV-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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