Washing Machine Capacitor: Test & Replace It (NZ Guide)

Diagnose first

The classic capacitor symptom: motor hums, drum doesn’t spin (or only spins when you nudge it). If the drum is locked solid or makes a grinding sound, it’s bearings. Different repair. Capacitor symptoms appear suddenly: machine was fine yesterday, today it just hums.

Not sure it’s the capacitor? Washing machine won’t spin: is the capacitor dead? runs through the 60-second check and the faults that look the same.

What you’ll need

• The replacement capacitor: match µF (±5%). 450VAC is the standard run voltage.
• Phillips and flat screwdrivers. T20 Torx is handy for some Bosch/Siemens models.
• Insulated screwdriver for discharge.
• Phone for wiring photos.
• A second pair of hands if you’re tipping a top-loader on its back.

Steps

1. Unplug at the wall

Not just off: out of the socket. There’s no breaker for a single appliance and you don’t want to chance it.

2. Drain water from the hoses

Disconnect the cold-supply hose at the wall and let it drain. Pull the drain hose out of the standpipe and let it drain into a bucket. You’ll be tipping the machine to get at the bottom; you don’t want a litre of water in the drum lid.

3. Get to the motor

Front-loaders: usually a rear service panel held by 4-6 screws. Top-loaders: tip the machine on its back (don’t lay it on its front: control panel damage). The motor is the cylindrical lump attached to the drum belt (older) or directly to the drum (newer direct-drive).

4. Find the capacitor

Usually mounted near the motor on a bracket, with two wires going to the motor. Direct-drive machines (no belt) don’t have a discrete run capacitor at all. If you can’t find one near the motor, your machine is direct-drive and this guide doesn’t apply.

5. Discharge, photograph, swap

Same drill as any other capacitor: bridge the terminals with an insulated screwdriver for 5-10 seconds. Photograph the wiring. Pull the spades, swap the cap, re-fit the bracket, reconnect the spades the same way.

6. Reassemble and test

Service panel back on. Hoses back. Plug in. Run a short rinse-and-spin cycle. The motor should engage smoothly within a second of the cycle starting.

Common gotchas

• Direct-drive machines (Fisher & Paykel SmartDrive, LG Direct Drive, and many other modern front-loaders), don’t use a discrete run capacitor; diagnosis is via the control board and it’s a service call. If there’s no belt, a capacitor won’t fix it.
• Belt-driven machines can throw the belt during a capacitor failure. Check the belt while you’re in there.
• µF value is printed on the capacitor’s side (e.g. “12µF ±5% 450VAC”). Most belt-drive washers use 8-16µF, commonly 10-12µF. Match the µF on the label; within ±5% is fine, and the voltage can be the same or higher. If the print has worn off, check the motor’s nameplate: don’t guess from the machine model.

Frequently asked questions

What size capacitor does a washing machine use?

Most belt-drive washing machines use an 8-16µF CBB60 run capacitor, most commonly 10-12µF. The exact value is printed on the side of the old capacitor. Match the µF on the label (within ±5%); 450VAC is the standard run voltage, and the same or a higher voltage rating is fine.

How do I know the capacitor is the problem?

The classic sign is a motor that hums while the drum doesn’t spin, or only spins when you nudge it, and the fault appears suddenly. If the drum is locked solid or grinds, it’s more likely the bearings, which is a different repair.

Does every washing machine have a motor capacitor?

No. Belt-driven machines usually have one on a bracket near the motor, with two wires to the motor. Direct-drive machines (no belt), including many modern front-loaders, don’t use a discrete run capacitor; diagnosis is via the control board and it’s a service call.

What if the µF value has worn off the old capacitor?

Check the motor’s nameplate for the value. Don’t guess it from the washing machine’s model.

How long does the job take?

About 30-45 minutes, if you’re comfortable laying the machine on its back, removing a service panel and tracing a wiring loom.

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If the motor still hums after a clean cap swap, the issue is bigger: bearings, brushes (on older universal motors), or control board. A motor service is usually cheaper than a new machine if the rest of the appliance is sound.