Troubleshooting

Diagnosis: An ‘O_C’ (Over Current) fault on a Phase Tech SubMonitor indicates the motor’s current draw has critically exceeded its Service Factor Amps (SFA) rating. This is a protective shutdown caused by severe mechanical binding in a worn pump or a catastrophic electrical failure, such as degraded and shorted motor windings. Professional diagnosis with a […]

Diagnosis: A Uv1 fault on a Yaskawa iQpump drive signifies a DC Bus Undervoltage, most often triggered by a sag in the incoming utility power or inadequately sized wiring. This condition starves the drive of energy, forcing the motor to draw excess current, which can lead to overheating and damage to windings and bearings. Troubleshooting

Diagnosis: A U_C (Under Current) fault on a Phase Tech SubMonitor VFD indicates the pump motor is no longer under a proper water load. This is typically caused by the well running dry, which starves the pump, or a catastrophic mechanical failure like a broken pump shaft. Immediate diagnosis is critical to prevent permanent motor

Diagnosis: The Yaskawa iQpump ‘oH’ fault code indicates a critical heatsink overheat, typically caused by direct sun exposure in hot climates, obstructed ventilation, or a failing cooling fan. Resolving this fault involves ensuring adequate airflow and shading for the drive, but it can also be a symptom of a failing pump motor drawing excessive current,

Diagnosis: A Phase Tech SubMonitor ‘Unb’ fault indicates a significant current difference between the three power phases supplied to your submersible pump motor. This condition, often caused by the utility’s power delivery, can also signal a failing motor winding or a high-resistance electrical connection. Immediate diagnosis is critical to prevent permanent motor burnout and costly

Diagnosis: A Yaskawa iQpump LF (Loss of Prime/Underload) fault indicates the pump is running dry, pumping air instead of water. This is typically caused by a dropping well water level, requiring professional well diagnostics and adjustment of the VFD’s operating frequency to prevent catastrophic pump damage. In this Guide: What Causes this Error? DIY Troubleshooting

Diagnosis: A fast blinking red light on a SymCom PumpSaver indicates a severe Overcurrent or Locked Rotor fault. This is typically caused by a seized pump/motor assembly or a critical short in the motor windings. Immediate shutdown is required, and professional diagnosis with a megohmmeter is necessary to determine if the pump needs replacement. In

Diagnosis: A slow blinking red light on your SymCom PumpSaver or MotorSaver indicates a critical ‘Dry Well’ or undercurrent fault. This occurs when the well water level drops below the pump intake, causing the motor to run without load and triggering the protective shutdown. The solution involves letting the well recharge and potentially having a

Diagnosis: A solid red light on a SymCom PumpSaver indicates severe rapid cycling, where the pump starts and stops too frequently. This is almost always caused by a failed hydro-pneumatic pressure tank (waterlogged) or a significant leak in the drop pipe, leading to a loss of system pressure. In this Guide: What Causes this Error?

Diagnosis: The Flint & Walling Commander VFD’s F1 fault code indicates a critical output short circuit, usually caused by a compromised downhole cable, a failed waterproof splice, or a shorted submersible motor. This is a hard fault requiring immediate shutdown to protect the drive. Repair is a high-difficulty task that involves pulling the pump from