What It Means
- Incorrect appliance unit size code selected.
Lennox Split & Multi-Split
Lennox Error Code E443
Split & Multi-Split: Air conditioner (outdoor), Heat pump (outdoor)
Causes & actions from Lennox
How it shows
- Outdoor control 7-segment display: E443
Check for proper configuring of unit size codes for outdoor unit in configuration guide or in installation instructions. If replacing inverter, verify inverter model matches unit size. The alarm/ fault clears after the correct match is detected following a reset. Remove the thermostat from the system while applying power and reprogramming.
Other manual wording
SL22KLV, SL22KLV-024, SL22KLV-036, SL22KLV-048, SL22KLV-060
Check for proper configuring under unit size codes for outdoor unit on configuration guide or in installation instructions. If replacing inverter, verify inverter model matches unit size. The alarm/fault clears after the correct match is detected following a reset. Remove the thermostat from the system while applying power and reprogramming.
Applicable models & manual sources
- EL18XCV
Incorrect appliance unit size code selected.
EL18XCV, EL18XCV-024, EL18XCV-036, EL18XCV-048, EL18XCV-060
- EL18XPV
Incorrect appliance unit size code selected.
EL18XPV, EL18XPV-024, EL18XPV-036, EL18XPV-048, EL18XPV-060
- EL19KPV
Incorrect appliance unit size code selected.
EL19KPV, EL19KPV-024, EL19KPV-036, EL19KPV-048, EL19KPV-060
- EL21KLV
Incorrect appliance unit size code selected.
EL21KLV, EL21KLV-024, EL21KLV-036, EL21KLV-048, EL21KLV-060
- EL22KCV
Incorrect appliance unit size code selected.
EL22KCV, EL22KCV-024, EL22KCV-036, EL22KCV-048, EL22KCV-060
- SL22KLV
Incorrect appliance unit size code selected.
SL22KLV, SL22KLV-024, SL22KLV-036, SL22KLV-048, SL22KLV-060
- SL25KCV
Incorrect appliance unit size code selected.
SL25KCV, SL25KCV-024, SL25KCV-036, SL25KCV-048, SL25KCV-060
- SL28XCV
Incorrect appliance unit size code selected.
SL28XCV, SL28XCV-024, SL28XCV-036, SL28XCV-048, SL28XCV-060
- SL22KLV
Incorrect appliance unit size code selected
SL22KLV, SL22KLV-024, SL22KLV-036, SL22KLV-048, SL22KLV-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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