Lennox Error Codes

May be related to an indoor unit room temperature sensor condition

May be related to an indoor unit heat exchanger temperature sensor condition

May be related to an outdoor unit temperature sensor condition

May indicate a condition related to the outdoor unit heat exchanger temperature sensor

The high pressure protection mechanism may have been activated; may be related to the refrigeration circuit

The low pressure protection mechanism may have been activated; may be related to refrigerant level

May indicate a protection condition related to the indoor unit fan motor

A communication issue is suspected between the indoor and outdoor units

May be related to an outdoor unit electrical system condition

A condition related to cooling performance is suspected; may be related to filter or airflow