Pool Pump Not Turning On
A pump that will not start is either not receiving power, not being told to start, or unable to start despite both. Working through those three in order finds the cause quickly.
Likely Causes
Tripped breaker or GFCI
Sometimes a nuisance trip, often a real fault. A breaker that trips again immediately is telling you something is wrong.
Timer or schedule problem
Mechanical timers fail and automation schedules get erased after a power outage — the pump is simply never being commanded on.
Failed capacitor
Classic symptom: the motor hums but the shaft does not turn.
Seized motor or impeller
Bearings that have failed completely, or an impeller locked with debris.
Variable-speed drive fault
An error code, a dead display or a control board failure will stop the pump even though power is present.
Automation relay failure
The controller commands the circuit but the relay never closes.
What You Can Safely Check
- Check the breaker and any GFCI outlet serving the equipment
- Confirm the timer or automation schedule is actually calling for the pump
- Look for an error code or blank display on a variable-speed pump
- Listen: humming means power is present and something is stuck
When to Call a Professional
If the breaker trips repeatedly, the motor hums, or a drive shows a fault code, stop and call. Repeated reset attempts on an electrical fault are how small failures become expensive ones.
Safety: Do not open motor or drive housings. Pool equipment circuits carry voltages that are dangerous around water.