Most washing machines have a timer that prevents you from opening the hatch just after the washing cycle ends. Instad you must wait for the timer to go off, usually a minute or two, before you can open the hatch.
Why? Would letting the user open the hatch immediately after washing ends pose any safety or other issues?
It’s not a component aware system. The last phase is generally the spin cycle. The controller knows to trigger the spin cycle, it knows to stop the spin cycle after a period of time. What it doesn’t know is whether those things actually happened. Particularly, it doesn’t know that the drum has actually stopped spinning. So, it just wait a predetermined amount of time before unlocking the door.
In the case of my own device the door actuator uses a wax motor. Put simply, current is changed to heat which melts the wax, pushing a pin the locks the door. To open the door, current is removed, the wax cools, hardens and shrinks and the pin slides back. Now the door can open. So, even if I remove power during a cycle the door will eventually unlock as the wax cools.
Of all the answers here, this definitely seems like the right one and the only one that makes sense.
Many machines use a bimetal to lock the door, a stupidly simple design. Metal heats up, bends and triggers the lock. It takes a while to cool down which is why it’ll take a while to unlock even if you unplug the machine.
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My best guess is safety, if you had a heavy load in there the momentum could keep the drum spinning much longer than normal. I’m sure they could add a sensor to check, but that’s just an extra cost. So rather than allowing you to open the machine while it’s still spinning and possibly injure yourself reaching in, they keep it locked for a few more minutes.
It’s safety for sure. Mine is pretty new and I can tell that it has a sensor for the drum rotating - it doesn’t unlock until movement has stopped. You could really mangle a finger if you got it caught between the moving drum and the stationary housing. The bitch is that mine is energy efficient and it spins easily, so a heavy load will keep spinning a long time.
It’s so that the machine elves have some time to hide!
On a serious note, I found this explanation here:
Washing machines must have some way in which you can lock the door closing mechanism when the machine is started up and then unlock them with a certain delay (normally two minutes) after the current has switched off via the program or on/off switch, in order to ensure that the door cannot be opened while some of the components are still rotating initially (in particular the motor and the drum of the spin-dryer).
Washing machines have a bi-metal strip inside the door lock which is heated by PTC Heater (resister) when live and neutral are activated on to the pcts it heats up and bends the bi-metal strip which then moves the arm to activate the common terminal and push a pin into the closed door to lock it in place. Once this has happened (usually a second or so see video) the power then can flow through to the common wire, and therefore on to the rest of the machine allowing it to start.
It’s to keep people from sticking their arms in there before it coasts to a stop.
The instructions say that it’s too make sure all the water has drained.
I always assumed it was to give the water time to drain out so when you open the door it doesn’t just spill out over the floor
Surely it could just wait with signaling the end of the program until the water has drained?
My washing machine is a top loader and has a pause button that will stop the water fill/spin cycle so you can open the door. The washer waits until the cycle pauses completely then unlocks the door
Am I missing something? I’ve opened the lid multiple times while the washer was going. All that happens is the water shuts off until you close the lid again. Never seen a washer that locks actually.
You’re probably talking about a top loader whereas the question relates to front loaders.
Many top loaders will lock at certain points in the wash. Most often during the spin cycle. A top load with an agitator is just begging to break an impatient child’s arm.
Yeah, makes sense. They’re not very popular in Australia anymore (use way more water) so I haven’t used a top loader since the 90s. The old ones used to just slow down to a stop once you opened the lid, but they literally didn’t have a lock on the lid.
There are high efficiency top loaders too. I have an old style one because I couldn’t afford to keep repairing my HE, and 400 for a new top loader was cheaper than replacing the motherboard in my HE for the 3rd time.
Fair dos
There’s still water in the drum. Ew wet clothes.
It checks if the water is really truly out so opening the hatch is safe (as in no water coming out causing water damage). And for that it waits a time so the water has time to gather in the bottom.
I got a side loader and it generally is spinning at least a little slowly until right before the timer goes off. Generally I can push the pause button at any point during the wash and after a few seconds it will unlock. My top loaders i used to be able to open at any time during the wash.
I imagine they have a buffer period to let the load stop spinning but you probably can override for earlier if you really want.
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Well, imagine someone opening the door if the water hasn’t fully drained out and the ensuing mess. If you’re wondering if someone is stupid enough to do that, then the answer is unequivocally yes. There is a reason the door locks for that amount of time - so somebody doesn’t brain fart, open the door, and flood the laundry room.
I have been saved by that washing machine lock on a number of occasions
So why not make the washing cycle end when the water has fully drained? I get the impression the timer starts after the drain.
My washing machine can be opened when running at any time so no idea what washing machines you have. Considering I want it to be going already when I add detergent.
Front-loaders usually restrict you from opening the door before they’re drained, or else some idiot would flood their apartment.
