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Mitsubishi MS-A09WA-1 Defrost Sensor Board
The defrost control board initiates the defrost cycle which helps to defrost your outdoor unit. The control board is relayed information from a temperature sensor that can be found near the condenser, in order to ascertain when to initiate the defrosting cycle.
Indications of a weakening defrost sensor board
- Your system could not work due to the amount of frost on the outdoor unit
- The main control board may show a particular error code when a defrost board fails to initialize
- The defrost feature has not run for quite some time even though there is a large amount of frost in the way
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