Pool Pump Capacitors

Voomi Supply carries replacement start, run, and dual pool pump capacitors from Vanguard, Pooltek, Marathon Motors, Hayward, and Zodiac/Jandy, matched by microfarad (µF) rating and voltage rather than by pump brand alone. A weak or failed capacitor is one of the most common reasons a pool pump motor hums but won't start, and swapping it is usually a fast, low-cost fix compared to replacing the motor. Every order ships with Voomi's 30-day return policy and free help confirming the right µF and voltage match.

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Capacitor Types We Carry

Pool pump capacitors fall into three types, and mixing them up is a common mistake:

Type

Typical Range

Duty

Role

Start capacitor

60–410 µF, 110–250VAC

Momentary (seconds)

Gives the motor a brief power boost to begin spinning, then disengages

Run capacitor

20–45 µF, 370–440VAC

Continuous

Stays in the circuit to maintain steady current while the motor runs

Dual capacitor

Combined start + run rating

Both

Combines both functions in one capacitor for pumps built to use a single unit

 

Reading a Capacitor's Label

Every capacitor lists its rating directly on the case, and reading it correctly is what actually determines fit, not the part's overall size or shape. A single-value label like “45 µF 370V” is a run capacitor rated for 45 microfarads at 370 volts. A dual capacitor is labeled with two numbers separated by a slash, such as “35/5 µF 370V”, where the first number is the run rating and the second is the start rating for a motor that uses both functions in one part. The label also lists a tolerance, usually ±5% or ±6%, which is the acceptable variance before the capacitor is considered worn out.

Capacitor Safety Precautions

A capacitor stores an electrical charge even after power is switched off, which makes a few precautions worth taking seriously:

  • Never touch the terminals with bare hands, even with the breaker off; discharge the capacitor first.
  • Use an insulated screwdriver or a discharge resistor, not a bare metal tool, to discharge it.
  • Handle a bulged, leaking, or burst capacitor with care and dispose of it properly rather than in regular household trash.
  • Confirm the breaker is off at the panel, not just the pump's local switch, before opening the electrical compartment.

If you're not confident handling a live electrical compartment, a licensed technician can complete the swap in a short service call.

Matching by Brand and Model

This collection carries Vanguard start capacitors, Pooltek start and run capacitors, a Marathon Motors run capacitor, a Hayward capacitor service kit, and Zodiac/Jandy fan motor capacitors built for specific Jandy Pro Series and heater fan applications. Fit depends on matching µF rating and voltage to your existing capacitor, not on buying the same brand as your pump; a Pooltek or Vanguard capacitor will work as a replacement on another brand's pump as long as the electrical specs line up. If you're replacing the pool pump motor itself rather than just the capacitor, or need other pool electrical supplies, those are stocked separately.

Frequently Asked Questions

Common signs of a failing pool pump capacitor include:

  • The motor hums but doesn’t start.
  • The motor starts slowly or intermittently shuts off.
  • You hear a clicking or buzzing sound near the pump.
  • The capacitor appears bulged, cracked, or leaking oil.

If your motor exhibits any of these symptoms, replacing the capacitor is usually a fast and cost-effective fix.

Always match the microfarad (µF) rating and voltage printed on your old capacitor label.

For example, if your current capacitor says “30 µF 370V”, the replacement must have the same µF rating and equal or higher voltage (e.g., 370V or 440V).

You can also reference your motor’s model number (found on the motor label) to find the correct capacitor in the manufacturer’s specifications.

On average, pool motor capacitors last between 3–5 years under normal conditions.

Heat, humidity, and frequent cycling can shorten their lifespan. To maximize longevity:

  • Keep the motor well-ventilated.
  • Protect it from direct sunlight and water exposure.
  • Inspect the capacitor every season for signs of swelling or corrosion.

Yes - many homeowners can safely replace a capacitor in just a few minutes.

  1. Turn off power at the circuit breaker.
  2. Discharge the capacitor using a resistor or insulated screwdriver.
  3. Note the wire positions or take a photo before removing it.
  4. Install the new capacitor, securing wires to the same terminals.

If you’re not comfortable working with electrical components, hire a licensed technician.

  • Start capacitors provide an initial energy boost to get the motor turning.
  • Run capacitors help maintain a steady current and motor efficiency after startup.

Some pumps use both, while others use only a dual capacitor that performs both functions.

 The most common reasons include:

  • Overheating due to direct sunlight or high ambient temperatures.
  • Moisture exposure, leading to corrosion.
  • Frequent cycling or short run times.
  • Voltage fluctuations or electrical surges.

If you have a multimeter with a capacitance setting, disconnect the capacitor and measure across the terminals.

The reading should be within ±6% of the rated µF value.

If the reading is far off, or if the capacitor shows physical damage, it needs to be replaced.

Yes. A capacitor rated for a higher voltage than your old one is safe to use and won't damage the motor; the microfarad (µF) rating is what needs to match closely, not exceed the voltage rating downward. Never install a capacitor rated for lower voltage than your original.

Yes. Multi-unit orders qualify for quantity-based pricing, and pool service companies can set up a trade account for faster reordering. Contact our support team to get pricing on a bulk order or set up an account.