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Lennox HP13-060 Defrost Sensor Board
The defrost control board initiates the defrosting phase if necessary, to keep the outdoor unit free from frost build-up. The board is influenced by a sensor which is near the condenser somewhere, in order to decide when the defrost cycle should begin.
Major indications of a dying Lennox defrost sensor board
- The HVAC system control board might issue a particular error code if the defrost board fails
- Most systems will not run at all because of the safety issue that the frost poses
- Defrost session never kicks in despite the fact that there is a lot of frost on the external unit
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