The G1324 is the factory Balboa replacement PCB for the BP20P4 spa control platform. This board controls: Pump 1 (1‑ or 2‑speed) Pump 2 (1‑speed) Blower or Circ Pump Ozone Spa Light 4.0 kW heater (via the BP20 heater tube) Topside panels: TP400, TP600, TP800, SpaTouch2/3 (depending on config) It is the correct board when your spa shows symptoms like: Dead or unresponsive topside Heater not activating Relay clicking or stuck relays “Watchdog” errors Burn marks or corrosion on the old PCB
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