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Mitsubishi MSZ-09UN Defrost Sensor Board
The defrost sensor board will determine when to initiate the defrost cycle which may be necessary to keep the outdoor unit free from frost build-up. The defrost board depends on a sensor located near the condenser to determine when the defrost cycle should begin.
Red flags of a dying defrost sensor board
- The AC may cease to operate due to too much frost
- The defrost feature never initiates despite that there is a large amount frost on the unit
- The main control board might give out a specific error code when the defrost board fails
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If you decide on picking up or ordering any Mitsubishi MSZ-09UN replacement part do your best and double check the correct model as well as make a visual inspection in order to be sure the correct replacement defrost sensor board is being ordered. There is no rule that says you have to install it yourself. Consult with a professional in your town or city to replace the part.
Feel free to download your manual for help.
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