The answer, before the detail
Short answer: check the supply and the door before anything else. start switch or control lock is the most likely cause on this dryer, and it costs nothing to rule out.
What the dryer is actually doing
- Nothing at all when start is pressed — no lights, no sound — A completely dead machine is a supply question first: breaker, outlet, or the cord.
- It only runs while the start button is held — The start circuit is not latching, which is a switch or a control fault rather than the motor.
- The panel lights up but nothing happens — Power is present and the machine is refusing, which points at the door switch or the start circuit.
- NEAR MISS — the drum turns but the clothes stay cold — A machine that runs without heating is a heating fault, and that page ranks the causes from the vent outwards.
The ranking, and why it is this way round
- Start switch or control lock — It belongs high on the list because it is free to check and because the alternative explanations all cost money. Top of the list, because everything below it is harder to check and less likely to be the answer. A commercial cabinet is built around service access rather than around a sealed box, so the serviceable parts rank above the sealed ones.
- The interlock doing exactly what it should — The switch wears because it is operated on every single load, and the plunger can stick or the lever can lose its adjustment. The machine then works sometimes, which owners read as an intermittent electrical fault. Second on the list — a real suspect, and the next one that can be settled by looking rather than measuring.
- An outlet that is dead, or a plug not fully home — A dryer takes a dedicated circuit, and a breaker that has tripped leaves the machine completely dead. A double breaker can also trip on one side only, which produces a machine that turns but never heats — a different complaint from the same cause. It ranks here because it is genuinely less common, not because it matters less when it happens.
- Drive belt broken, so the motor runs without the drum — Belts usually warn before they break, with a squeal or a slap over the preceding weeks, so this cause is often the second half of a noise complaint that was left alone. Last, and deliberately so — it should be where a diagnosis ends rather than where it starts.
Check in this order, and why
- Select a cycle from scratch and hold start for a few seconds — Some machines arm on a short press and only run when the button is held. First, and it costs nothing but a minute of attention.
- Listen for the switch click as the door closes — A door that shuts silently where it used to click has lost its switch action. Second in order, and only worth doing once the first has come back clean.
- Check the breaker for the dryer and switch it fully off and on — Note whether anything else nearby is also dead, which points at the circuit rather than the machine. Last of the owner-side checks; anything past it belongs to a technician.
The checks you can make yourself
- Clear any control lock and select a plain timed cycle — Timed cycles bypass the sensing that can hold an auto cycle back.
About 10 min
- Clean the door catch and the switch plunger, and check the door closes squarely — Never tape the switch closed to make the machine run: that interlock exists for a reason.
Tools: clothAbout 15 min
- Reseat the plug with the breaker off, then restore power — Never work at a large-appliance outlet with the circuit live.
About 15 min
- STOP at the point where a panel has to come off to go further — Everything past that point is measured, not looked at, and measuring means live terminals. Book the visit instead.
Before you touch anything
Safety
Isolate the machine at the breaker before removing a panel, and never reach into a drum with the power available. If you smell gas near a gas dryer: do not switch anything on or off, leave the building, and call the gas utility or the emergency number from outside. Do not look for the leak yourself.
When to hand it over
Call an electrician rather than an appliance technician if the breaker trips when the machine starts, or if the outlet is dead with the breaker closed. That is a wiring job and no dryer part will fix it.
Pages next to this one
What is not on this page
This is the general page for the class rather than the page for your model. Where a family- or model-specific Koolmore page exists, it is linked here and it is the one to read first. Absent by design: part numbers, torque figures, wiring detail and anything else that differs between families.
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
