What It Means
- The outdoor unit high pressure switch has opened.
- o c The outdoor unit high pressure switch has opened. c F s
Lennox Split & Multi-Split
Lennox Error Code E412
Split & Multi-Split
E412 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 outdoor unit high pressure switch has opened.
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: E412
Unit pressure is above the upper limit. System is shut down. The high pressure switch opens at 590PSIG and closes at 418PSIG. Confirm that the system is properly charged with refrigerant. Check for clogged TXV, blockage to indoor unit blower motor, clogged refrigerant filter. Confirm that the outdoor unit is clean. The alarm clears after the pressure switch closes or a power reset. For heating, indoor CFM may be set too low. For zoning system, zone CFM may be set too low.
Other manual wording
EL21KLV, EL21KLV-024, EL21KLV-036, EL21KLV-048, EL21KLV-060
Unit pressure is above the upper limit. System is shut down. The high pressure switch opens at 590 PSIG and closes at 418 PSIG. Confirm that the system is properly charged with refrigerant. Check for clogged TXV, blockage to indoor unit blower motor, clogged refrigerant filter. Confirm that the outdoor unit is clean. The alarm clears after the pressure switch closes or a power reset. For heating, indoor CFM may be set too low. For zoning system, zone CFM may be set too low.
Applicable models & manual sources
- EL18XCV
The outdoor unit high pressure switch has opened.
EL18XCV, EL18XCV-024, EL18XCV-036, EL18XCV-048, EL18XCV-060
- EL18XCV
The outdoor unit high pressure switch has opened.
EL18XCV, EL18XCV-024, EL18XCV-036, EL18XCV-048, EL18XCV-060
- EL18XPV
The outdoor unit high pressure switch has opened.
EL18XPV, EL18XPV-024, EL18XPV-036, EL18XPV-048, EL18XPV-060
- EL18XPV
The outdoor unit high pressure switch has opened.
EL18XPV, EL18XPV-024, EL18XPV-036, EL18XPV-048, EL18XPV-060
- EL19KPV
The outdoor unit high pressure switch has opened.
EL19KPV, EL19KPV-024, EL19KPV-036, EL19KPV-048, EL19KPV-060
- EL19KPV
The outdoor unit high pressure switch has opened.
EL19KPV, EL19KPV-024, EL19KPV-036, EL19KPV-048, EL19KPV-060
- EL22KCV
The outdoor unit high pressure switch has opened.
EL22KCV, EL22KCV-024, EL22KCV-036, EL22KCV-048, EL22KCV-060
- EL22KCV
The outdoor unit high pressure switch has opened.
EL22KCV, EL22KCV-024, EL22KCV-036, EL22KCV-048, EL22KCV-060
- SL22KLV
The outdoor unit high pressure switch has opened.
SL22KLV, SL22KLV-024, SL22KLV-036, SL22KLV-048, SL22KLV-060
- SL22KLV
The outdoor unit high pressure switch has opened.
SL22KLV, SL22KLV-024, SL22KLV-036, SL22KLV-048, SL22KLV-060
- SL25KCV
The outdoor unit high pressure switch has opened.
SL25KCV, SL25KCV-024, SL25KCV-036, SL25KCV-048, SL25KCV-060
- SL25KCV
The outdoor unit high pressure switch has opened.
SL25KCV, SL25KCV-024, SL25KCV-036, SL25KCV-048, SL25KCV-060
- SL28XCV
The outdoor unit high pressure switch has opened.
SL28XCV, SL28XCV-024, SL28XCV-036, SL28XCV-048, SL28XCV-060
- SL28XCV
The outdoor unit high pressure switch has opened.
SL28XCV, SL28XCV-024, SL28XCV-036, SL28XCV-048, SL28XCV-060
- EL21KLV
The outdoor unit high pressure switch has opened.
EL21KLV, EL21KLV-024, EL21KLV-036, EL21KLV-048, EL21KLV-060
o c The outdoor unit high pressure switch has opened. c F s
5 models
EL21KLV, EL21KLV-024, EL21KLV-036, EL21KLV-048, EL21KLV-060
Heat pump (outdoor)
How it shows
- Outdoor control 7-segment display: E412
Unit pressure is above the upper limit. System is shut down. The high pressure switch pens at 590 PSIG and closes at 418 PSIG. Confirm that the system is properly harged with refrigerant. Check for clogged TXV, blockage to indoor unit blower motor, clogged refrigerant filter. Confirm that the outdoor unit is clean. The alarm lears after the pressure switch closes or a power reset. or heating, indoor CFM may be set too low. For zoning system, zone CFM may be et too low.
Applicable models & manual sources
- EL21KLV
o c The outdoor unit high pressure switch has opened. c F s
EL21KLV, EL21KLV-024, EL21KLV-036, EL21KLV-048, EL21KLV-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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