The Goulds Pumps Aqua Boost II Controller is a compact variable‑frequency drive and PLC that regulates pump speed to maintain constant pressure or flow in residential and light commercial systems. Common failures include loss of power due to blown fuses or degraded supply capacitors, overheating of the motor driver ICs, faulty pressure/flow sensor inputs, and firmware corruption that triggers error codes such as “E02” (motor over‑current) or “E07” (sensor fault). Begin troubleshooting by verifying the 120 V/240 V input voltage and inspecting the main power fuse; check all wiring connections to the motor, inlet/outlet pressure sensors, and level switches for continuity and correct polarity; then read any displayed error codes via the LCD panel and cross‑reference them with the manual’s diagnostic table.[oss-gpt-20b]