If your dishwasher won’t start and the door feels loose or won’t click shut, the latch is nearly always why. The machine reads an unlatched door as open and won’t run a cycle no matter what you press. Before you write off the control board, check the latch first. This one plays out the same on Bosch, Samsung, LG, Whirlpool, KitchenAid, Maytag, and GE.
Why it won’t latch, most common first
The latch mechanism has a handful of parts that fail on their own.
Worn or broken latch assembly. The plastic catch wears down, especially on a machine that runs daily. You push the door shut and it doesn’t click, or it clicks and won’t hold, or it holds a minute then lets go mid-cycle. If you can wiggle the door while it’s “closed,” the latch is worn.
Misaligned strike plate. The strike plate is the metal piece in the tub opening the latch hooks into. Shift it a few millimeters, from a hard bump or a move without re-leveling, and the latch can’t grab. You can often see it sitting crooked or pushed in.
Weak or broken door spring. Most doors run springs, sometimes a cable-and-pulley, that hold door tension. Lose one and the door droops enough to miss the strike plate. The tell: it swings open faster than it used to or hangs at an odd angle.
Debris in the latch channel. Food, detergent buildup, or a chip of plastic lodges in the assembly and stops it moving freely.
Dead door switch. The microswitch in the latch tells the board the door is shut. The latch can feel like it grabs fine, but if the switch is dead the machine still won’t start. Less common, but it explains the cases where the click sounds normal and nothing happens.
Two safe checks
Wipe the latch and strike plate. Open the door all the way, find the latch at the center-top of the door, and clear any debris with a damp cloth. Do the same on the strike plate. Detergent crust in the channel alone sometimes causes the whole thing.
Watch the alignment. Close the door slowly and see where the latch meets the strike plate. If they’re clearly not lining up, that’s useful. Don’t force it.
If a wipe and a look don’t turn up an obvious fix, stop. The next steps mean disassembly.
What the fix involves
Anything past wiping debris means taking the inner door panel apart. Replacing the latch is panel screws out, wiring harness off, new part in. Sounds simple, but older wiring is brittle and the panel clips break if you hurry.
A dead door switch needs a meter to confirm the failure before ordering the part, then the same teardown. Skip the test and you can swap the switch only to find something else was the real cause.
Spring or cable work is trickier. The springs are under tension and the routing has to be exact. Get it wrong and the door slams open or won’t hold a stable angle. It’s the kind of job where one small miss creates a new problem. Worth knowing too: if the machine’s under warranty, a DIY repair can void it depending on the brand.
Book it
If the door won’t latch and a quick clean didn’t fix it, this is a good time to call. Parts are cheap for most brands and labor usually runs under an hour, so it’s one of the least expensive appliance calls.
Bay Area Appliance Repair Service covers the whole Bay Area. We carry common latch assemblies on the truck for the brands we see most. Book at (925) 999-4095 or online and we’ll aim for same or next day. It’s a $75 diagnostic, credited to the repair, with the price once we confirm the part.