Dishwashers are one of those appliances we take for granted — until they stop working. The frustrating part is that most dishwasher problems are either a simple DIY fix or a clear signal that it's time to call a professional. This guide walks through the six most common dishwasher problems and tells you exactly which category each one falls into — so you're not guessing, and not overpaying.
1. Dishes Aren't Getting Clean
If you're pulling dishes out with food residue still on them, the most common culprit is clogged spray arms. The spray arms have small holes that jet water onto your dishes during the wash cycle. These holes get blocked with mineral deposits and food debris over time.
DIY fix: Remove the spray arms (usually unscrew or unclip from the center post) and soak them in white vinegar for 30 minutes, then use a toothpick to clear any remaining clogs in the holes. Also clean the filter assembly at the bottom of the dishwasher — this is often overlooked entirely and gets coated with grease and food particles that reduce wash performance significantly.
If the spray arms are clear and the problem persists, the issue may be low water pressure or a failing wash pump motor. At that point, it's time to call a professional.
2. Water Isn't Draining
Standing water at the bottom of the dishwasher after a completed cycle is one of the most common dishwasher problems we see at MY APPLIANCE Repair. Before you call a technician, check these things in order:
- Clean the filter: The cylindrical filter at the bottom of the dishwasher needs regular cleaning. A clogged filter prevents proper drainage. Remove it, rinse it under running water, and use a soft brush to remove buildup. This is a DIY job.
- Check the drain hose: Look under the sink where the drain hose connects. Make sure it isn't kinked or clogged with debris.
- Run the garbage disposal: If your dishwasher drains into the garbage disposal, run the disposal before starting a cycle to clear any blockage in the common drain line.
Call a pro if: The filter is clean and hoses are clear, but water still pools. This usually points to a failed drain pump motor — a repair that requires dismantling the machine's base assembly.
3. Door Latch Problems
If the dishwasher door doesn't latch securely, the machine won't start — it's a built-in safety interlock. Door latches wear out over time, especially on units that get heavy daily use.
DIY check: Look for obvious obstructions preventing the door from closing fully, or visible damage to the latch mechanism itself. Sometimes the strike plate just needs minor adjustment — check your model's manual for this.
Call a pro if: The latch assembly is broken or the door is misaligned beyond simple adjustment. A door latch replacement is typically an affordable repair and well worth doing rather than replacing the dishwasher. You can book a service call with MY APPLIANCE Repair and we can usually have a latch replaced in a single visit.
4. Dishwasher Won't Fill With Water
If you hear the machine start its cycle but no water seems to be entering the tub, the issue is usually the water inlet valve. This valve controls the flow of water into the dishwasher and can fail mechanically or become blocked with mineral deposits over time.
DIY check first: Make sure the water supply shutoff valve under the sink is fully open — sometimes it gets accidentally bumped. Also check the float switch, a small plastic dome or cylinder inside the bottom of the dishwasher. If it's stuck in the raised position, it incorrectly tells the machine the tub is full.
Call a pro for: Actual water inlet valve replacement. While accessible, it involves working with water supply lines and electrical connections — not a DIY job for most homeowners.
5. Strange Noises During Cycles
Some noise is entirely normal — water spraying, the wash pump running, dishes occasionally clinking. But these specific sounds warrant attention:
- Grinding or scraping noise: Something may be caught in the spray arm or in the chopper blade assembly. Check for broken glass, small bones, or hard food particles that have made it past the filter.
- Loud thumping: Often caused by a spray arm hitting a tall item that's been loaded too close to the center. Rearrange the load and check if the noise resolves.
- Persistent humming or high-pitched whining: May indicate a failing wash pump or drain pump motor. This requires professional diagnosis.
6. Water Leaking Onto the Floor
A leaking dishwasher requires prompt attention — water damage to flooring and cabinetry can be expensive, and mold grows quickly in concealed spaces. This is one of the most urgent common dishwasher problems because the secondary damage often costs more than the original repair.
Common causes and fixes:
- Worn door gasket: The rubber seal around the door perimeter dries out and cracks over years of use. This is a DIY replacement — gaskets cost $20–$50 and typically snap or slide into a channel around the door frame.
- Wrong detergent: Using regular dish soap instead of dishwasher-specific detergent causes excessive sudsing that pushes water out the door seal. Use only dishwasher detergent.
- Cracked tub or faulty pump seal: These internal leaks require professional repair.
If you're not sure where the leak originates, run the dishwasher and watch carefully as it fills and begins washing. The leak source usually becomes visible within the first few minutes of the cycle.
When to Stop Troubleshooting and Call a Pro
Most dishwasher problems caught early are inexpensive to fix. The DIY steps above will resolve a surprising number of issues — but when the problem is electrical, involves water supply lines, or requires pulling the machine out from under the counter, a qualified technician is the right call.
Connecticut homeowners can book a service call directly on our site, or contact our team at MY APPLIANCE Repair with questions before scheduling. We serve customers across Connecticut and can typically diagnose and repair most dishwasher issues in a single visit — saving you from a larger repair bill or a flooded kitchen floor.