First-Time Dishwasher Use: Setup, Rinse, and First Cycle Steps

Check the hookup before anything else

A new dishwasher needs correct water, drain, and power connections before it runs. Confirm the water supply line is connected to the inlet valve and that the valve is shut off until you are ready to test. Inspect the drain hose for kinks and make sure it is routed correctly, either through an air gap or a high loop, to prevent backflow. For electrical connections, verify that the unit is on a dedicated circuit and that the power cord or hardwiring is secure. See the dishwasher electrical connection and dishwasher supply line guides for more detail.

Also check that the dishwasher is level and that the anti-tip bracket is fastened. An unlevel unit can cause leaks, poor water distribution, and excessive noise. Use a level placed on the top of the tub and adjust the leveling legs as needed.

If you have a portable or countertop model, confirm the faucet adapter is tight and the drain hose is positioned to empty into the sink. Portable models also require a secure connection to a grounded outlet. Review the built-in vs portable dishwashers guide if you are unsure which type you have.

Remove all shipping materials

New dishwashers arrive with packaging designed to protect the racks, spray arms, and interior during transport. Remove all visible tape, foam blocks, cardboard, and plastic film from the racks, cutlery basket, and spray arms. Pay special attention to the bottom of the tub, where a shipping foam strip or tie may be holding the spray arm in place. If left in place, these items can block water flow and damage the wash system.

Also check the filter assembly. Many models use a removable filter basket or a self-cleaning filter. Look inside the sump area for any packing materials that may have been placed under the filter. The dishwasher filter cleaning guide shows how to access and inspect the filter. Remove any protective covers from the detergent dispenser and rinse aid compartment, as these often have pull-tabs or plastic seals.

Finally, wipe the interior and door gasket with a damp cloth to remove dust or debris from the factory. Do not use abrasive cleaners, which can scratch the stainless steel or plastic tub.

Prerinse the machine with a rinse cycle

After removing all packaging, run a rinse cycle without any dishes. This flushes out any manufacturing residue, loose debris, or water that may have been left in the lines during installation. Select the 'Rinse' or 'Quick' cycle if your model has one, or a normal cycle with no detergent. The dishwasher cycles explained guide lists the options available.

This rinse step also confirms that the dishwasher fills and drains properly. While the cycle runs, inspect under the unit for any drips at the water inlet or drain connections. If you see a puddle, shut off the dishwasher immediately and tighten the connections or call a plumber. Check that water is entering the tub and that the drain pump expels water when the cycle reaches the drain phase. For more on drain setups, see dishwasher drain options.

Once the rinse cycle finishes, open the door and check that no water remains in the bottom of the tub. A small amount in the sump is normal, but standing water above the filter level may indicate a drain issue. Check the drain hose for kinks and ensure the drain path is clear.

Run a first cycle with detergent

With the machine rinsed and confirmed leak-free, it is time to run a complete cleaning cycle. Load the dishwasher as you normally would, but do not add dishes yet: the goal is to clean the tub and any remaining oils or metal shavings from the manufacturing process. Place a dishwasher-safe cup or bowl with a few tablespoons of detergent on the top rack, or fill the detergent dispenser with a small amount of powder, gel, or a pod. Do not use more than the recommended amount; excess detergent can cause foaming and buildup. See the dishwasher detergent types and dishwasher detergent dosage chart pages for guidance.

Select a normal or heavy cycle that includes a heated wash and a dry phase. The high water temperature helps sanitize the interior and remove any protective oils from the spray arms and pump. Cycles with a soil sensor work well for an empty load, but you can also choose a heavy-duty or pot scrubber cycle if you want extra cleaning power. The soil sensor guide explains how the sensor adjusts water and energy use.

Run the cycle to completion and allow the dishwasher to dry. After it finishes, open the door and sniff for any unusual smells. A slight metallic odor is normal on the first run; it should disappear after this cleaning cycle. Check that the filter is still clean and free of any debris. Then you are ready to load your first real batch of dishes.

What to check after the first cycle

Once the first cleaning cycle is done, perform a final inspection. Look for any water spots or streaks on the interior that might indicate hard water, and consider adding rinse aid if your model has a dispenser. The rinse aid how it works article covers how it helps drying and reduces spots.

Confirm that the door is sealing tightly and that the gasket is not deformed. Even a small gap can cause leaks and energy loss. The dishwasher door gasket check page explains how to inspect and clean the gasket.

Finally, verify that all shipping materials were removed by checking the underside of the racks and the spray arm hubs. If you find any leftover tape or foam, remove it and run an additional rinse cycle. Once everything is clean and leak-free, your dishwasher is ready for regular use. For more on using your machine efficiently, see how to load dishwasher for best cleaning.

What to pick for your use

Questions

Do I need to prerin the dishwasher before first use?

Yes. Running a rinse cycle without dishes removes manufacturing residues and verifies that water fills and drains properly. It also flushes out any debris left in the sump or spray arms.

Should I use detergent during the first cycle?

Yes, but only a small amount. Running a normal cycle with a little detergent helps clean the inside of the machine and removes any oils or metal particles from the manufacturing process. Use less than you would for a normal load to avoid foaming.

What if I see water leaking during the first run?

Stop the cycle and turn off the water supply. Check the water line connections at the inlet valve and the drain hose connections. Tighten any loose fittings, then run another rinse cycle. If the leak persists, consult a plumber or the installation manual.

How long should the first cleaning cycle take?

The cycle time varies by model and selected program. A normal cycle typically runs 1.5 to 2 hours, but the first cycle may be longer because the dishwasher may run a diagnostic or calibration routine. Check your owner's manual for the expected duration.

Is it normal for a new dishwasher to smell a little metallic or plasticky?

Yes. The interior and new parts may release a slight odor during the first use. Running a cycle with detergent should eliminate it. If the smell persists after several cycles, check for leftover packaging or contact the manufacturer.

Do I need to install a rinse aid before the first cycle?

Not necessarily, but adding rinse aid before the first cycle can improve drying and reduce water spots, especially if you have hard water. Follow the manufacturer's instructions for the rinse aid dispenser.