Swimming Pool Pump Troubleshooting Guide - Maygo Pool Equipment Manufacturer

Swimming Pool Pump Troubleshooting Guide

1. Pump Failure to Start

Symptoms: No response or humming sound

Causes:

• Phase loss (voltage <200V)

• Failed start capacitor (capacitance drop >20%)

• Impeller mechanical lock

Solutions:

① Test input voltage with multimeter (balanced 380V±5%)

② Measure capacitor with LCR meter (refer to nameplate value)

③ Rotate shaft manually; if resistance >2N·m, disassemble to clean impeller

2. Abnormal Noise

High-pitched squeal:

• Bearing wear (vibration >4.5mm/s)

• Dry running mechanical seal

Low-frequency vibration:

• Loose base bolts (torque <25N·m)

• Cavitation (NPSH margin insufficient)

Procedures:

① Locate noise source with vibration analyzer

② Replace bearings with SKF 6205-2RS (60% grease fill)

③ Inject hydrodynamic lubricant (e.g., Pacer Pool Lube)

3. Insufficient Flow

Diagnostic parameters:

• Inlet/outlet differential pressure >15psi

• Motor current <70% rated value

Root causes:

• Impeller erosion (vane thickness <50% original)

• Clogged strainer basket (ΔP >5psi)

• Pipe diameter reduction (<80% pump size)

Corrective actions:

① Measure impeller dimensions per ANSI/HI 1.1

② Inspect pipe elbows with borescope

③ Verify system flow using Q=πD²/4√(2gH)

4. Water Leakage

Leak types:

• Shaft seal weepage (>3 drops/min)

• Casting defects (revealed in 30psi pressure test)

Repair standards:

• Replace mechanical seal (John Crane Type 152)

• Apply metal-filled epoxy for casing repair (cure >24h)

5. Overheating Trip

Critical thresholds:

• Motor temperature rise >80℃

• Insulation resistance <1MΩ (500V megger test)

Countermeasures:

① Clean cooling fins (air pressure ≤0.3MPa)

② Check winding balance (>10% imbalance requires rewinding)

③ Adjust VFD carrier frequency (recommended 4kHz)

Finally

Pro Tips:

• Monthly lubricate seals with NLGI #2 lithium grease

• Winterize with 25% antifreeze solution

• VFD pumps: Avoid operation below 30% rated speed