My Pool Pump Won't Turn On — What's Wrong?

Tripped Circuit Breaker or Blown Fuse

This is the most common cause and the easiest to fix. Power surges, storms, or even a brief overload can trip the circuit breaker that feeds your pool pump. Perth's summer storms are a frequent culprit.

Check your switchboard for a tripped breaker (it will be in the middle position or off). If the breaker trips again immediately after resetting, do not keep resetting it — this indicates a deeper electrical fault.

Reset the breaker once. If it holds, your pump should restart. If it trips again, call an electrician — there may be a wiring fault or the pump motor itself has a short circuit.

Faulty or Stuck Timer / Controller

Most Perth pool setups use an automatic timer or controller to run the pump during off-peak hours. If the timer has lost its programming (common after a power outage), has corroded contacts, or the clock has drifted, it may not be sending the signal to start the pump.

Mechanical timers can also develop worn tripper pins or a seized clock motor. Digital controllers can sometimes freeze and need a reset.

Check that the timer is set to the correct time and the on/off trippers are in the right positions. Try switching the pump to manual override — if it runs, the timer is the issue. Reprogram it or replace the timer if it is damaged.

Burnt-Out Capacitor

The start capacitor gives the motor an extra boost of energy to get spinning. Over time — especially in Perth's extreme heat — capacitors degrade, swell, or crack. When the capacitor fails, the motor cannot generate enough torque to start and just sits there humming.

A failed run capacitor can cause similar symptoms, or the pump may start but run weakly and overheat before shutting off on its thermal overload.

Capacitor replacement is straightforward for a pump technician. It is an affordable repair and one of the most common fixes we perform. Do not attempt this yourself — capacitors store electrical charge and can deliver a dangerous shock.

Thermal Overload Has Tripped

Pool pump motors have a built-in thermal overload switch that shuts the motor off when it gets too hot. This is a safety feature, but it can become a recurring problem if the underlying cause is not addressed. Common triggers include running the pump during the hottest part of the day without adequate ventilation, a clogged impeller making the motor work harder, or worn bearings creating extra friction and heat.

Let the pump cool down completely, then try restarting. If it keeps tripping, the motor likely needs servicing — the bearings may need replacing, or the motor windings could be deteriorating. Ensure the pump enclosure has good airflow and is not sitting in direct afternoon sun without shade.

Seized or Jammed Motor Shaft

If a pool pump sits unused for extended periods — common in Perth where some homeowners shut down their pump over winter — the motor shaft can seize due to corrosion, mineral buildup, or dried-out bearings. The motor tries to spin but cannot overcome the resistance, draws excessive current, and shuts down on its safety devices.

Sometimes a technician can free the shaft by carefully turning it manually and lubricating the bearings. If the bearings are severely corroded, the motor will need to be pulled apart, cleaned, and rebuilt with new bearings and seals. Prevention tip: run your pump briefly once a fortnight even in winter.

Failed Motor Windings

Motor windings are coils of copper wire inside the motor that create the magnetic field to spin the shaft. Over the years, heat, moisture, and chemical exposure degrade the insulation on these windings. Eventually they short-circuit, either to each other or to the motor housing. This is usually the end of the road for the motor in its current state.

A motor with failed windings needs professional assessment. In some cases the motor can be rewound, but often it is more cost-effective to replace the motor or the entire pump unit. We will always give you an honest comparison of repair versus replacement costs.