Sump Pump Diagnostics

Purpose

Diagnostic procedures for sump pump issues.

Pump not running, running constantly, cycling rapidly, noisy, or basement flooding

Check power: plugged in? Outlet working? Breaker?

Manually lift float — does pump activate?

Float activates but pump doesn't: motor failure — replacement needed

Check discharge line for freeze or clog

Battery backup: check battery condition and charge

Check valve stuck/failed — water flowing back into pit

Float switch stuck up — free the float

High water table — pump may be undersized

Check for plumbing leak draining into pit

Float switch range too narrow — adjust or replace

Check valve not holding — water falls back, re-triggers pump

Install or replace check valve on discharge

Debris in impeller — clean intake

Loose discharge pipe — secure with clamps

Cavitation — pump too powerful for pit or pit too shallow

Bearing noise — pump wearing out, recommend replacement

Pour water into pit — verify activation and shutoff

Check discharge flow away from foundation

Verify check valve holds after pump stops

Always recommend battery backup — power outages during storms when pumps needed most
Sump pump maintenance is a great membership upsell
If basement flooded, beware electrical hazards in standing water
Document pump brand, model, condition for future reference