Jandy Industries PCB#6474‑G Power Center is the main control board for pool and spa automation, integrating pump, heater, filter, and lighting functions via an Aqualink interface. Common failures on this board include burnt or tripped relays (especially the 6 A/30 V contacts), degraded capacitors on the power supply section, and shorted I/O lines to the PLC module; these often manifest as erratic pump speeds, loss of heater control, or intermittent display errors. First‑check diagnostics: verify the 24 VAC input and ensure the board’s voltage regulator outputs are within spec (12 VDC/5 VDC), inspect all relay contacts for corrosion or burn marks, and review any stored error codes on the LCD or via the Aqualink handheld to pinpoint malfunctioning modules.[oss-gpt-20b]