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Lennox G40UH-36A-070X Defrost Sensor Board
The defrost sensor control board determines when to initiate the defrost cycle which actually helps to remove frost build-up that may accumulate. The defrost sensor board is influenced by a sensor located in the outdoor unit to verify when to initiate the defrosting cycle.
What warnings are present when my AC defrost sensor board is about to stop working?
- The defrost sequence will not kick in even though there is a large amount of frost on the external unit
- The control board may issue an alphanumeric error code if the defrost board fails
- The whole system may stop running due in part to frost blocking the airflow outside
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