Jandy PCB#8124A 8125 pool controller

The Jandy PCB#8124A (also labeled 8125) is the main control board for Aqualink pool and spa systems, handling power distribution, sensor inputs, and relay outputs. Common failure points in this class of industrial controllers include burned or cracked capacitors on the power section, damaged ICs due to voltage spikes, and corroded solder joints on the 52‑pin connector. Begin troubleshooting by verifying that the board receives the correct 12 V DC supply and that all input voltages are within spec; then inspect for visible signs of overheating or component damage, followed by a continuity check of the relay contacts and I/O pins.[oss-gpt-20b]

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