Lennox Split & Multi-Split

Lennox Split & Multi-Split Error Code E180

Split & Multi-Split

E180 means different things on different Split & Multi-Split models. Enter your model number to see only your reading, or find your model below.

What It Means

  • The outdoor unit ambient temperature sensor has malfunctioned. As a result the outdoor unit control will not perform low ambient cooling.
  • The iComfort thermostat has found a problem with the outdoor unit's ambient temperature sensor.
  • CBX40UHV: Outdoor air temperature sensor (OAS) out of range.
  • The S30 thermostat has found a problem with the outdoor unit's ambient temperature sensor.

Causes & actions from Lennox

The outdoor unit ambient temperature sensor has malfunctioned. As a result the outdoor unit control will not perform low ambient cooling.

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: E180

Valid temperature reading is lost during normal operation and after outdoor control recognized sensors. Compare outdoor sensor resistance to temperature/ resistance charts in unit installation instructions. Replace sensor pack if necessary. At the beginning of (any) configuration, furnace or airhandler control detects the presence of the sensor(s). If detected (reading in range), appropriate feature is shown in the S40 thermostat About screen. The alarm / fault clears upon configuration, or when normal values are sensed.

Other manual wording (1 of 3)

EL18XCV, EL18XCV-024, EL18XCV-036, EL18XCV-048, EL18XCV-060, EL18XPV, EL18XPV-024, EL18XPV-036, EL18XPV-048, EL18XPV-060

Valid temperature reading is lost during normal operation and after outdoor control recognized sensors. Compare outdoor sensor resistance to temperature/ resistance charts in unit installation instructions. Replace sensor pack if necessary. At the beginning of (any) configuration, furnace or airhandler control detects the presence of the sensor(s). If detected (reading in range), appropriate feature is shown in the iComfort S30 thermostat About screen. The alarm / fault clears upon configuration, or when normal values are sensed.

Other manual wording (2 of 3)

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

Valid temperature reading is lost during normal operation and after outdoor control recognized sensors. Compare outdoor sensor resistance to temperature/ resistance charts in unit installation instructions. Replace sensor pack if necessary. At the beginning of (any) configuration, furnace or airhandler control detects the presence of the sensor(s). If detected (reading in range), appropriate feature is shown in the S30 thermostat About screen. The alarm / fault clears upon configuration, or when normal values are sensed.

Other manual wording (3 of 3)

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

Valid temperature reading is lost during normal operation and after outdoor control recognized sensors. Compare outdoor sensor resistance to temperature/ resistance charts in unit installation instructions. Replace sensor pack if necessary. At the beginning of (any) configuration, furnace or airhandler control detects the presence of the sensor(s). If detected (reading in range), appropriate feature is shown in the iComfort S40 thermostat About screen. The alarm / fault clears upon configuration, or when normal values are sensed.

Applicable models & manual sources
  • EL19KPV

    The outdoor unit ambient temperature sensor has malfunctioned. As a result the outdoor unit control will not perform low ambient cooling.

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

    EL19KPV manual, page 42

  • EL21KLV

    The outdoor unit ambient temperature sensor has malfunctioned. As a result the outdoor unit control will not perform low ambient cooling.

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

    EL21KLV manual, page 45

  • EL22KCV

    The outdoor unit ambient temperature sensor has malfunctioned. As a result the outdoor unit control will not perform low ambient cooling.

    EL22KCV, EL22KCV-024, EL22KCV-036, EL22KCV-048, EL22KCV-060

    EL22KCV manual, page 39

  • SL25KCV

    The outdoor unit ambient temperature sensor has malfunctioned. As a result the outdoor unit control will not perform low ambient cooling.

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

    SL25KCV manual, page 36

  • EL18XCV

    The outdoor unit ambient temperature sensor has malfunctioned. As a result the outdoor unit control will not perform low ambient cooling.

    EL18XCV, EL18XCV-024, EL18XCV-036, EL18XCV-048, EL18XCV-060

    EL18XCV manual, page 36

  • EL18XPV

    The outdoor unit ambient temperature sensor has malfunctioned. As a result the outdoor unit control will not perform low ambient cooling.

    EL18XPV, EL18XPV-024, EL18XPV-036, EL18XPV-048, EL18XPV-060

    EL18XPV manual, page 36

  • SL28XCV

    The outdoor unit ambient temperature sensor has malfunctioned. As a result the outdoor unit control will not perform low ambient cooling.

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

    SL28XCV manual, page 30

  • SL22KLV

    The outdoor unit ambient temperature sensor has malfunctioned. As a result the outdoor unit control will not perform low ambient cooling.

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

    SL22KLV manual, page 42

The iComfort thermostat has found a problem with the outdoor unit's ambient temperature sensor.

35 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

Heat pump (outdoor)

How it shows
  • Outdoor control 7-segment display: E180

During normal operation, after the outdoor control recognizes sensors, the alarm will be sent only if valid temperature reading is lost. Compare outdoor sensor resistance to temperature/resistance charts in unit installation instructions. Replace sensor pack if necessary. At the beginning of (any) configuration, furnace or air-handler control will detect the presence of the sensor(s). If detected (reading in range), appropriate feature will be set as 'installed' and shown in the S40 thermostat 'About' screen. The alarm / fault will clear upon configuration, or sensing normal values.

Other manual wording

EL18XCV, EL18XCV-024, EL18XCV-036, EL18XCV-048, EL18XCV-060, EL18XPV, EL18XPV-024, EL18XPV-036, EL18XPV-048, EL18XPV-060

During normal operation, after the outdoor control recognizes sensors, the alarm will be sent only if valid temperature reading is lost. Compare outdoor sensor resistance to temperature/resistance charts in unit installation instructions. Replace sensor pack if necessary. At the beginning of (any) configuration, furnace or air-handler control will detect the presence of the sensor(s). If detected (reading in range), appropriate feature will be set as 'installed' and shown in the iComfort S30 thermostat 'About' screen. The alarm / fault will clear upon configuration, or sensing normal values.

Applicable models & manual sources
  • EL19KPV

    The S40 thermostat has found a problem with the outdoor unit's ambient temperature sensor.

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

    EL19KPV manual, page 80

  • EL21KLV

    The S40 thermostat has found a problem with the outdoor unit's ambient temperature sensor.

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

    EL21KLV manual, page 91

  • EL22KCV

    The S40 thermostat has found a problem with the outdoor unit's ambient temperature sensor.

    EL22KCV, EL22KCV-024, EL22KCV-036, EL22KCV-048, EL22KCV-060

    EL22KCV manual, page 75

  • SL22KLV

    The S40 thermostat has found a problem with the outdoor unit's ambient temperature sensor.

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

    SL22KLV manual, page 85

  • SL25KCV

    The S40 thermostat has found a problem with the outdoor unit's ambient temperature sensor.

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

    SL25KCV manual, page 70

  • EL18XCV

    The iComfort S30 thermostat has found a problem with the outdoor unit's ambient temperature sensor.

    EL18XCV, EL18XCV-024, EL18XCV-036, EL18XCV-048, EL18XCV-060

    EL18XCV manual, page 75

  • EL18XPV

    The iComfort S30 thermostat has found a problem with the outdoor unit's ambient temperature sensor.

    EL18XPV, EL18XPV-024, EL18XPV-036, EL18XPV-048, EL18XPV-060

    EL18XPV manual, page 78

Outdoor air temperature sensor (OAS) out of range.

Models: CBX40UHV

Air handler (indoor)

How it shows
  • Single-character display: E180

This manual entry does not list further causes or actions.

Applicable models & manual sources

The S30 thermostat has found a problem with the outdoor unit's ambient temperature sensor.

5 models

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

Air conditioner (outdoor)

How it shows
  • Outdoor control 7-segment display: E180

During normal operation, after the outdoor control recognizes sensors, the alarm will be sent only if valid temperature reading is lost. Compare outdoor sensor resistance to temperature/resistance charts in unit installation instructions. Replace sensor pack if necessary. At the beginning of (any) configuration, furnace or air-handler control will detect the presence of the sensor(s). If detected (reading in range), appropriate feature will be set as 'installed' and shown in the S30 thermostat 'About' screen. The alarm / fault will clear upon configuration, or sensing normal values.

Applicable models & manual sources
  • SL28XCV

    The S30 thermostat has found a problem with the outdoor unit's ambient temperature sensor.

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

    SL28XCV manual, page 64

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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