Jandy 8124A 8125 Spa Controler

The Jandy 8124A/8125 Spa Controler is a power‑center PCB that interfaces with the Aqualink RS‑485 bus to manage spa pumps, heaters, and lighting. Common failures on this board include burned or blown fuses in the power input section, cracked solder joints around the voltage regulator ICs, and failure of the main microcontroller due to over‑voltage spikes from the pool’s 120 V supply. Other typical issues are shorted relay contacts and degraded capacitors on the DC‑DC converter rail. First‑check diagnostics: verify that the 120 V input is clean and within spec; inspect the board for visible burn marks or cracked components, especially around the voltage regulator and microcontroller; and read any diagnostic LEDs or error codes displayed by the spa’s control panel to pinpoint a specific fault area.[oss-gpt-20b]

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