Most dishwashers last 9 to 12 years. That’s the range you’ll see from appliance repair data and manufacturer guidance, and it holds up with what I see in the field. Some units push 15 years with good upkeep; others start causing trouble around year 8 if they’ve been run hard or poorly maintained.
Whether yours is worth fixing depends less on age alone and more on what’s actually wrong with it.
What Actually Wears Out First
The parts that fail most often, roughly in order:
Door latch and gasket. The door seal dries out and cracks over time, especially if the machine sits in a hot kitchen. A leaking door is one of the more common calls I get. Gaskets are inexpensive and a quick job for a tech.
Drain pump and wash pump. If your dishwasher hums but doesn’t drain, or runs a cycle but dishes come out dirty and wet, the pump is usually involved. Pumps are mid-range repairs. On a machine that’s 5 to 8 years old, it generally makes sense to fix it. On a 12-year-old unit, it depends on what else is worn.
Control board. Electronic control failures show up as erratic behavior: cycles that won’t start, mid-cycle stops, random error codes. Control boards can be expensive, sometimes more than half the cost of a new entry-level machine. That’s where age starts to matter more.
Spray arms and float switch. These clog or stick rather than fail outright. Often cleanable. Worth checking before you call anyone.
Water inlet valve. Slow filling, no filling, or water trickling in when the machine is off, all point here. Inlet valves are a moderate repair and almost always worth doing if the unit is under 10 years old.
How to Think About Repair vs. Replace
The rough rule I use: if the repair costs more than half the price of a comparable new dishwasher, and the machine is already 8-plus years old, replacement is usually the smarter call. You’re not just paying to fix the current problem, you’re gambling that nothing else goes in the next year or two.
On the other hand, if the machine is 4 to 7 years old and it’s a single component, repair almost always wins. A new dishwasher runs $500 to $1,000 for a decent mid-range model, plus installation. A pump replacement or valve swap is a fraction of that.
Age plus repair cost plus how the machine has been treated. That’s really the whole formula.
One thing people overlook: if your dishes consistently come out with white film, spots, or grit, and cleaning the filter and arms doesn’t fix it, that’s not always a sign of a failing machine. It’s often a water quality or detergent issue. I’ve seen people replace a perfectly functional dishwasher over hard water buildup that a descaling treatment would have solved.
What You Can Check Yourself
Before calling a tech, go through this list:
- Pull out the bottom rack and clean the filter. Most dishwashers have a cylindrical filter that unscrews. If it’s clogged with food debris, cleaning it often resolves poor wash performance.
- Check the spray arms. Pull them off and rinse the holes under the faucet. A toothpick clears stubborn blockages.
- Inspect the door gasket. Run your fingers along the rubber seal and look for cracks, gaps, or mold buildup. Clean with a damp cloth; replace if it’s visibly cracked.
- Look at the float switch (the small plastic dome on the floor of the tub). It should move up and down freely. If it’s stuck up, the machine thinks it’s full and won’t fill.
- Check that the knockout plug is removed from the drain hose if you recently installed a new garbage disposal. This is the cause of a surprising number of “dishwasher won’t drain” calls after a disposal replacement.
None of these require tools or technical knowledge. If you’ve checked all of them and something is still wrong, that’s when it’s time to call.
What a Tech Actually Does
When I send a tech out on a dishwasher call, the first thing they do is run the machine through a cycle while watching and listening. Noise, leaks, whether it fills and drains, how hot the water gets, whether the door latch holds, all of that tells a story before they open anything up.
From there it’s component testing: pump motor resistance, inlet valve function, control board outputs. A good tech can usually diagnose a dishwasher in 30 to 45 minutes and give you a straight answer on whether the repair makes financial sense.
We don’t push repairs that don’t make sense. If a machine is 11 years old and the control board is shot, I’ll tell you that. Sometimes the honest answer is “buy a new one.”
Signs It’s Probably Time to Replace
- Rust inside the tub or on the door liner. Once rust starts, it spreads, and it contaminates dishes.
- Multiple components failing within a short period.
- The unit is over 10 years old and you’re looking at a major repair.
- Replacement parts are on long backorder or hard to source (this can happen with older discontinued models, though major brands generally support parts for many years after production ends).
- It’s using noticeably more water and energy than current models. Older machines, particularly those made before 2013, can use two to three times the water of a modern efficient unit per cycle.
A Note on Brands
Bosch tends to last longer than average in my experience, and their parts availability is generally good. Whirlpool and KitchenAid are solid mid-range options. Samsung and LG dishwashers have improved over the years but have more variable reliability on older models. Miele builds quality machines but parts cost more and fewer independent technicians stock them.
None of this means you should refuse to repair a Samsung or immediately trust a Bosch. Individual units vary. A well-maintained cheaper machine often outlasts a neglected premium one.
When to Call
If you’ve done the basic checks and something is still off, stop running the machine. If there’s water on the floor, definitely stop. Water near cabinetry or flooring turns into a much bigger problem fast.
Everything past those basic checks (pumps, valves, control boards, door latch hardware) needs proper component testing and the right parts to do correctly. Getting it wrong on a pump or inlet valve can mean flooding your kitchen. It’s not worth attempting without experience.
If you’re in the Tri-Valley or East Bay, call us or book online at adriumservice.com. We’ll get you on the schedule fast, often same or next day when we can. You’ll get a clear diagnosis, a straight price to fix it, and an honest repair-vs-replace recommendation. No pressure either way.