14 - TROUBLESHOOTING421
Problem Cause Corrective action
3. Pump runs without water output • Airlocking/cavitating
• Pump strainer & impeller area clogged with
debris
• Inspect & reposition hose for short vertical dis-
charge
• Faulty or clogged check valve may add to
pump air locking
• Disconnect pump & clean outside of strainer,
clean debris around impeller, & reattached &
re-hook wiring
4. Pump shaft corroded • Electrolysis, cracked housing • Inspect pump housing for cracks which can
cause leakage into motor cavity causing cor-
rosion
• Possible incorrect current running through wir-
ing causing corrosion.
5. Pump impeller spins backward • Check wiring • Switch wiring for correct polarity
6. Wires overheated, melted insulation • Incorrect fuse size, possible jammed impeller • Make sure that impeller is free to rotate
• Check to make certain correct fuse rating is
installed
• REPLACE ALL DAMAGED WIRING
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