Dishwasher Troubleshooting: Fix Common Problems

Most dishwasher problems fall into a handful of familiar patterns — it will not start, will not drain, does not clean well, leaks, or makes strange noises. Work through the checks below before assuming you need a repair visit.

Dishwasher will not start

• Door not fully latched — push the door firmly until it clicks. The cycle cannot begin unless the latch engages.
• No power — check the circuit breaker and, on some installations, the wall switch or outlet under the sink that powers the dishwasher.
• Control lock / child lock is on — look for a lock indicator on the panel and hold the lock button for 3 seconds to release it.
• A cycle was interrupted — press and hold Start/Cancel for 3 seconds to reset, then select a fresh cycle.

Standing water / will not drain

• Clogged filter — twist out the cylindrical filter at the tub floor, rinse it under hot water, and clear trapped food.
• Kinked drain hose — pull the dishwasher forward slightly (if freestanding access allows) and check the hose for sharp bends.
• Blocked air gap or disposal connection — clean the small air-gap cap next to the faucet; if a new garbage disposal was recently installed, its dishwasher inlet knockout plug may still be in place.

Dishes are not clean

• Spray arms blocked — tall items can stop the arms from spinning. Reload so nothing touches the arms, and poke clear the small holes with a toothpick.
• Water not hot enough — run the kitchen tap until the water is hot before starting the dishwasher, especially on older models.
• Over-rinsing before loading — modern detergents need some food soil to work against; scrape, do not pre-wash.
• Wrong detergent or too little — use fresh automatic-dishwasher detergent and fill the dispenser to the recommended line.

Dishes are not drying

• Rinse aid empty — refill the rinse-aid dispenser; it makes a bigger difference to drying than most people expect.
• Heated dry turned off — energy-saving modes often disable heated dry. Enable it for plastic-heavy loads.
• Unloading order — unload the bottom rack first so water pooled on top-rack items does not drip onto dry dishes.

Leaking water

• Too many suds — the number-one cause. Only use automatic-dishwasher detergent, never liquid hand dish soap.
• Door gasket debris — wipe the rubber seal around the door; trapped food or a twisted gasket lets water escape.
• Overfilled rinse aid — wipe up spills in the dispenser area, which can foam over during the cycle.

Unusual noises or bad smells

• Grinding or rattling — usually a spray arm hitting dishes or debris in the filter. Stop the cycle and check before running it again.
• Musty smell — clean the filter, then run an empty cycle on the hottest setting with a dishwasher cleaner. Leave the door slightly ajar between uses.
• Burning smell — stop the dishwasher immediately, switch it off at the breaker, and call a technician.