Appliance Spares
Updated 2 August 2026
Quick answer: A dryer that hums for a few seconds and then stops — or needs a push on the drum to get going — usually has a failed run capacitor. It is a small, inexpensive part (under $20 for most dryers, as at August 2026) that gives the motor its starting torque, and on many Australian dryers it can be replaced at home in about 20 minutes.
Why does my dryer hum but not spin?
The motor in most vented and heat-pump dryers relies on a run capacitor to create the phase shift that starts rotation. When the capacitor drifts out of specification, the motor receives power but cannot generate enough torque to turn the drum, so you hear a hum, sometimes followed by a click as the thermal overload trips. Three other faults produce a similar symptom, so check the table below before ordering anything.
| What you observe | Most likely cause |
|---|---|
| Hums a few seconds, then silence; drum spins freely by hand | Run capacitor |
| Motor runs but drum doesn’t turn; you may smell rubber | Broken or slipped drive belt |
| Drum starts only if you spin it by hand first | Run capacitor (weak, not fully failed) |
| No sound at all, no lights | Door switch, thermal fuse or power supply |
How do I test a dryer run capacitor?
Unplug the dryer at the wall before removing any panel. Capacitors store charge after power is disconnected — discharge the terminals with an insulated-handle screwdriver across both terminals before touching them. Locate the capacitor (a small cylinder or block near the motor, usually with two spade terminals), note its microfarad (µF) rating printed on the body, and test it with a multimeter on the capacitance setting. A reading more than about 10% below the printed rating means the capacitor should be replaced. If your meter has no capacitance mode, the practical test is substitution: fit a new capacitor of the identical µF and voltage rating. If any wiring is damaged or you are not confident working inside the cabinet, stop and use a licensed repairer — the Australian product safety regulator recommends leaving electrical repairs to qualified people.
Which capacitor does my dryer need?
Match the µF rating printed on your existing capacitor, and check your dryer’s model number (on the sticker inside the door rim) against the fitment lists below. A single 8 µF run capacitor — part 0588400004 — fits 67 documented dryer models across three brands: Simpson, Westinghouse and Electrolux. That one part covers most of the common Simpson 39S/40S/Sirocco family and their Westinghouse and Electrolux equivalents.
| Part number | Rating | Fits |
|---|---|---|
| 0588400004 dryer run capacitor | 8 µF, 2-pin | Simpson, Westinghouse and Electrolux dryers — 67 documented models |
| H00330506020B Fisher & Paykel capacitor | OEM spec | Fisher & Paykel DE8060P1, DE8060P2 |
| Universal 4 µF 450 V run capacitor | 4 µF, 450 V | Dryers specifying a 4 µF motor capacitor (match the printed rating) |
Is it the capacitor or the belt?
Open the door and turn the drum by hand. If it rotates freely with light, even resistance, the belt is probably intact and the capacitor is the stronger suspect. If the drum spins with no resistance at all, or you can see the belt lying loose, the belt has failed. On older Omega and Euromaid dryers the element, belt and capacitor commonly age together, which is why they are sold as a combined heat restore kit (element, capacitor, belt and filters) — replacing the set in one open-cabinet session avoids doing the job twice.
Frequently asked questions
Can I use a capacitor with a higher µF rating than the original?
No. Fit the same µF value the manufacturer specifies. A higher rating changes the motor’s phase angle, increases winding temperature and shortens motor life; a lower rating may not start the drum at all.
How long does a dryer run capacitor last?
Typically 5–10 years depending on load frequency and ambient heat. Capacitors age gradually — a dryer that starts reluctantly on cold mornings is often showing early capacitor drift rather than sudden failure.
Is a humming dryer dangerous to keep running?
Repeated stalled starts overheat the motor windings until the thermal overload trips. Occasional attempts won’t destroy the motor, but running it stalled repeatedly can, turning a small capacitor replacement into a motor replacement. Unplug it until the capacitor is replaced.
Where is the model number on my dryer?
On a sticker inside the door rim or on the rear panel. Use that full model number to confirm fitment before ordering — the same brand often uses different capacitors across model families.
Disclaimer: this article is general information only and is provided without warranty of any kind. Appliance designs vary between models and production runs — always follow the manufacturer’s instructions, switch off and unplug the appliance before starting any work, and confirm parts against the model number on your appliance’s model sticker. Any repair is undertaken at your own risk and Oz Appliance Spares accepts no liability for injury, loss or damage arising from work performed after reading this guide, to the maximum extent permitted by law. If in doubt, use a qualified technician.
