Dishes are coming out dirty, cloudy, or still wet, and it feels like the whole dishwasher just died. Before you price a new one, know this: the single most common reason a dishwasher “stops working” isn’t the machine at all — it’s a clogged filter. But there’s a real difference between that and a pump or control board problem, and knowing which one you’re looking at changes whether this costs you nothing or several hundred dollars.
Here’s how to tell which situation you’re in.
Check the filter and spray arms first
Most modern dishwashers have a removable cylindrical filter at the bottom of the tub, under the lower rack. Food particles, grease, and labels collect there over time, and once it’s clogged, water can’t recirculate properly — dishes come out with a cloudy film, food residue, or a gritty layer that wasn’t there before. Pull the filter, rinse it under the tap, and scrub off anything stuck to the mesh. While you’re in there, check that the spray arms spin freely and their holes aren’t blocked with debris — spin them by hand to confirm. This is the single most common reason a dishwasher “stops cleaning,” and it costs nothing to fix. Time: about ten minutes.
If the filter’s clean, it’s the pump or the board
Once you’ve ruled out a clogged filter and spray arm — everything’s clear and spinning — and dishes are still coming out dirty, water isn’t draining, or the unit won’t start a cycle at all, the problem lives in one of two places: the drain pump (the motor that pushes wash and rinse water out) or the control board (the electronics that run the wash cycle and communicate with the buttons).
Pump symptoms: standing water at the bottom of the tub after a cycle, a loud grinding or humming noise, or a cycle that runs but never seems to actually clean.
Control board symptoms: the unit doesn’t respond to button presses, a cycle starts and then stops partway through, blinking error lights, or the machine won’t power on at all.
Why age changes the math
Dishwashers are built to run for roughly 9 to 12 years under normal use. Under about 8 years old, a single failed part — a pump motor, a door latch switch, a heating element, a control board — is usually a straightforward repair, because parts are still stocked and a tech can source them without much trouble. Past 10 to 12 years, you’re often looking at one component failing right as several others are close behind it, and OEM parts for an older model get harder and pricier to find, if they’re still made at all.
What repair costs vs. what replacement costs
A pump or control board repair typically runs $150 to $400 including a service call, less if you’re comfortable swapping the part yourself. A new dishwasher, installed, runs roughly $500 to $1,200 depending on features — with basic units at the low end and quiet, higher-capacity models pushing toward the top.
The decision, simply
Clogged filter if dishes went from clean to dirty gradually and you haven’t cleaned the filter in a while — free fix, ten minutes. Repair if the unit is under about 8 years old and only one component (pump, board, latch) is clearly at fault. Replace if it’s 10-12+ years old, more than one part is failing, or the repair quote is closing in on half the price of a new unit — at that point, paying for parts on an aging dishwasher rarely beats a new one on cost per year.
DIY or not
Cleaning the filter and spray arms is fully DIY — no tools required, just your hands and a sink. Swapping a drain pump or door latch is a reasonable DIY project for a comfortable homeowner, with the water supply and breaker off and the owner’s manual in hand. Control board replacement is also doable, but boards vary a lot by brand — worth confirming the diagnosis (not a wiring or sensor issue upstream) before you buy the part.
Not sure which one you’re looking at?
Tell me what the dishes look like coming out, whether water’s draining, and how old the unit is. I’ll tell you whether this is a filter clean, a pump repair, or time to replace — a written diagnostic with the specific read and honest next step, $19.99, back to you in minutes.
