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.
this post was submitted on 12 Aug 2023
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So why not make the washing cycle end when the water has fully drained? I get the impression the timer starts after the drain.
All washing machines throughout my life (it would be like 6 or 7 at this point) did the “locked for a while” thing except for my latest one, from Samsung, that does exactly that: it only considers the cycle finished (plays a slightly annoying song to let me know) after it has completely drained. So, I can open the door as soon as it lets me know it is done.
Maybe that's your machine being oddly programmed. Every machine I've seen unlocks right after it finishes it's cycle. It can also be stopped and unlocked anywhere halfway, but it takes some time to drain the water (usually a few seconds, not a full minute like you mentioned originally).
what device would you use to check the water has drained?
I have been saved by that washing machine lock on a number of occasions
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.
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.
In case you'd like to see bigclive explain it in detail: https://www.youtube.com/watch?v=PIm7q_U3UEM
Here is an alternative Piped link(s): https://piped.video/watch?v=PIm7q_U3UEM
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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.
But why not just beep after that? What’s the point of beeping before the door is unlocked?
Mine beeps when the door unlocks, but I've seen many that beep before the final check. Either to satisfy some "1 hour wash cycle" target or perhaps they expect people to walk to the machine when it beeps and the check isn't that long so it's probably going to be unlocked when you get there?
I’m looking for this beep-and-unlock feature next time I buy a washing machine…
Mine beeps and simultaneously unlocks the door. Beeping befor you can open it truely does sound stupid… Never had that with any washing machine here in Switzerland though.
My bet would be it's waiting for temperature to drop.
Edit for the downvoting folk: Some of the profiles of my washing machine have temperatures of up to 90°C
I would bet that the water for the rinse cycle would be cold though.
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?
Mine doesn’t do this, but it does do a few slow spins right at the end so that everything settles to the bottom. Maybe yours is also doing this by waiting?
Possibly.
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
Are you sure you're talking about a washing machine and not a dish washer?
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.