A dryer will not run unless it is sure the door is closed. That rule protects hands and pets from a hot, turning drum, but it also means a small, cheap part can take the whole machine out of service. When the door will not latch, swings open on its own, or looks shut while the dryer ignores the start button, the cause is nearly always one of four things: the latch, the strike, the door switch, or a control lock you did not know was on.
Several of these take only a few minutes to check yourself. Below we explain how the parts work together, how to tell which one has failed, and where the line sits between a quick homeowner fix and a repair call.
How the door, latch and switch work together
Most dryers use a simple arrangement. The strike is the small catch, hook or ball on the door. The latch is the spring clip or catch in the cabinet that grabs it and holds the door shut against the seal. Just behind the door opening sits the door switch, a plunger or lever that gets pressed in when the door closes. When that switch closes, the timer or control board receives the signal that it is safe to turn the drum and heat.
Some newer models use a magnetic door sensor instead of a plunger, and some front-load styles lock the door electrically during the cycle. The principle is the same: no confirmed closed door, no start. We see all of these parts wear out on older machines around Calgary, and when any one fails the dryer either will not stay shut or will not know it is shut.
Latch, strike or switch?
Signs it is the latch or strike
- The door will not stay closed, or pops open as soon as the drum starts turning.
- You have to slam the door or lean on it to get the dryer going.
- The plastic catch looks cracked, bent or worn smooth.
- The door sags on its hinges, so the strike no longer lines up with the latch.
On many models the latch is a simple spring clip that loosens after years of use. A sagging door can often be fixed just by tightening the hinge screws, which is worth trying before ordering anything.
Signs it is the door switch
- The door closes firmly, but nothing happens when you press start.
- The drum light stays on with the door closed, or never comes on with it open.
- The dryer starts, then stops when the load shifts or the cabinet vibrates. That pattern overlaps with a dryer that stops mid-cycle, so it is worth reading both.
- You no longer hear the soft click of the switch when the door shuts.
Door error codes
Electronic dryers often report the problem directly. On Samsung models, dE, dC or dF means a door, latch or door-sensor problem. LG uses dE when the door is not fully closed, and Bosch shows DR for the same thing. Some GE dryers show 008 when the door switch has stuck closed after five cycles, and Electrolux uses E42 for a door sensing failure that traces back to the control board. Our dryer error code lookup lists the codes for other brands, and the Samsung codes section has model notes for the door faults we see most.
Check the child lock first
Many electronic dryers have a child lock or control lock that disables the buttons. It is easy to switch on by accident while wiping the panel or reaching over the machine. Look for a small padlock or key icon on the display. The unlock method varies by brand, but it usually means pressing and holding one button, or two buttons together, for about three seconds. Your owner's manual names the exact buttons.
A locked panel can look exactly like a door fault, because the dryer simply ignores start. If the lock icon will not clear, or several buttons have stopped responding, a stuck key or a control fault may be involved instead.
Quick diagnosis table
| Symptom | Likely cause | DIY or technician |
|---|---|---|
| Door pops open when drum turns | Worn latch or strike | DIY check, part often simple |
| Must slam the door to start | Sagging door or weak latch | DIY hinge screws, else technician |
| Door shut, no start, no click | Failed door switch | Technician |
| Starts, then stops on bumps | Loose switch or wiring | Technician |
| Buttons ignored, padlock showing | Child lock on | DIY, see manual |
| No lights or sound at all | Power supply, not the door | DIY breaker check, then technician |
Safe checks before you call
Unplug the dryer before you touch the latch, the door opening or anything inside the cabinet.
- Look for something in the way. A sock or towel caught in the door seal can stop the door from closing fully.
- Check the lint filter. On some models, a filter that is not fully seated sits near the door opening and blocks the switch or triggers a fault.
- Inspect the strike and latch for cracks or a loose fit, and tighten the door hinge screws if the door sags.
- Press the switch actuator gently with the dryer unplugged. It should move freely and spring back with a click.
- Clear the child lock using the steps in your manual.
- Check the breaker. A dryer with no lights at all has a power issue, not a door issue. Our post on a dryer that won't start at all covers that.
Never tape a switch down, wedge it with a folded card or jump its wires to make the dryer run. The door switch is what keeps hands away from a spinning, hot drum, and defeating it can also damage the control.
Stacked, compact and front-load doors
Stacked laundry pairs and compact dryers often use tighter latch designs and switches that are hard to reach without moving the whole unit. Do not force the door or pry at the latch, as the plastic housing cracks easily. Front-load style doors on some models also lock during the cycle, so a door that will not open after a cycle can be a lock fault rather than a stuck latch. If your dryer is part of a stacked set, our stacked dryer repair page explains how we handle access safely.
Reversible doors are another source of trouble. If someone swapped the door to open the other way, the strike or switch actuator may have been fitted on the wrong side or left loose.
When to call a technician
If the door is clear, the child lock is off and the dryer still will not start or keeps stopping, the latch or switch probably needs replacing, or the wiring between the switch and the control has a fault. These are usually quick repairs when the right part is on the truck, and our electric dryer repair technicians carry common door switches and latches for the major brands. Fast Appliance Repair handles door problems on gas and electric dryers across Calgary, Airdrie, Chestermere and surrounding towns, often the same day. Call (587) 779-6919 to book. A flat diagnostic fee covers the visit, you see a full quote before anything is replaced, and the repair is backed by a 90-day parts and labour warranty.