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Bryant 478 Defrost Sensor Board
The defrost sensor board controls when to launch an important defrosting cycle if necessary, to defrost your outdoor unit. The control board relies on a defrost sensor located somewhere by the condenser to make the decision on when the defrost cycle should begin.
Signals to watch for in a failing AC defrost sensor board
- The defrost feature never initiates despite the fact that there is quite a bit frost that makes the unit run like crap
- The main board may issue an error of some type when the defrost control board refuses to initialize properly
- The system will stop working because of the frost blocking the flow of air
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If you are going to be buying or purchasing any Bryant 478 part do your best and make sure of the correct model and also make a visual comparison so that you are positive that the correct defrost sensor board is the one being purchased. Installation of the defrost sensor board is a breeze provided you have the time and have the proper tools to do it right.
Feel free to download your manual for help.
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