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International Comfort Products H9MPX080J12A2 Defrost Sensor Board
The defrost sensor board controls when to launch an important defrosting cycle which may be necessary to keep the outdoor unit free from frost build-up. The defrost board depends on a defrost sensor located somewhere by the condenser to make the decision on when to begin.
Major symptoms the defrost sensor board is dead
- The primary control board may throw an error number referring to the failed defrost sequence
- AC and heating system could stop functioning for the simple fact of the fact that there is too much frost
- Defrost mode never kicks in even though there is quite a bit frost that has built up
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