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Lennox XC21 Defrost Sensor Board
The defrost control board determines when or if to start the defrost sequence which assists to remove frost build-up that may accumulate. The board looks to a temperature sensor located near the condenser to determine when to begin.
Simple indications of a defective Lennox defrost sensor board
- The defrost feature never runs especially when there is frost on the unit
- AC and heating system could stop operating for the simple fact of too much frost
- Your main control board may issue an error code if the defrost board fails
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Before buying or ordering any Lennox XC21 part, do your due diligence and double check the correct model as well as make a visual inspection in order to be sure the right defrost sensor board is being ordered. Some pros could be quite expensive to hire so it may be beneficial to look around your area to acquire the best rate if you do not want to pay too much.
Feel free to download your manual for help.
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