The Goulds Pumps AquaBoost II AB2S010 is a wall‑mounted variable frequency drive and pump‑specific PLC that adjusts motor speed to maintain constant pressure or flow for residential and light commercial applications. Common failure points in this class of controllers include power supply issues (overvoltage, phase loss), internal relay or contactor wear, capacitor degradation on the inverter stage, and sensor/transducer input faults such as broken wiring or dirty connections. Initial troubleshooting should verify 230 V single‑phase input is within ±15 %, check all I/O terminals for continuity and proper voltage, inspect the drive’s status LEDs for error codes, and visually examine the PCB and capacitors for burn marks or bulging.[oss-gpt-20b]