Causes: unstable power supply, VFD control issues, bearing wear, or fluctuating load. Solutions: check power supply stability, verify VFD settings and parameters, inspect bearings, and ensure the load is consistent and within motor rating.

Actions:
1) Identify cause (moisture, heat, age, contamination),
2) Dry motor windings if moisture is the issue,
3) Clean out contamination,
4) Test insulation resistance regularly,
5) If insulation resistance is critically low, rewind or replace the motor.

Causes: gradual impeller wear, increasing system resistance, clogged suction strainer, or seal degradation. Solutions: inspect and replace worn impeller, check and clean suction filter/strainer, verify system piping isn't scaling or clogging, and replace seals if needed.

Causes: fluctuating system demand, air entrainment in fluid, unstable suction conditions, or pressure gauge malfunction. Solutions: install pulsation damper, check for air leaks, stabilize suction level, and verify gauge accuracy.

Safety first: shut off power immediately. Then:
1) Check for damaged cable insulation,
2) Inspect motor terminal box for moisture or contamination,
3) Test winding insulation resistance with megohmmeter,
4) Dry out motor if wet,
5) Replace motor if insulation failure is confirmed.

Causes: impeller wear, suction pressure too low, air leakage, incorrect rotation direction, or system head higher than expected. Solutions: inspect and replace worn impeller, check NPSH conditions, seal suction line leaks, verify motor rotation, and recalculate system head requirements.