These boards are typically inside of the air handler. On the higher end systems they are also outside in the condensing unit. They take the place of relays and timers, ultimately controlling the sequence of events that your system goes through to operate properly. They can also be damaged by power surges, but for the most part are pretty reliable.
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Pure Air Conditioning
2043 Trade Center Way
Naples,
FL
34109
Phone: 239-597-7873