🍽️ Dishwasher Smells Like Burnt Plastic: Causes & Fixes

Why Does My Dishwasher Smell Like Burnt or Melted Plastic?

A burnt plastic smell from your dishwasher is alarming but usually has a straightforward explanation. Here are the most common causes:

1. A Plastic Item Fell onto the Heating Element

This is the most common cause. A plastic lid, utensil, or small container can slide off the rack during the wash cycle and land on the heating element at the base of the dishwasher. The element heats to high temperatures during the drying phase and will melt any plastic that touches it.

What to do:

1. Wait until the dishwasher is completely cool before opening it.
2. Remove the lower rack and locate the heating element (a coiled metal loop at the bottom).
3. Check for melted plastic stuck to the element. If found, carefully peel off any solidified plastic with a wooden or silicone utensil once the element is cool — never when hot.
4. Run an empty cycle with a cup of white vinegar to clear residual smell.

2. New Dishwasher Break-In Smell

Brand new dishwashers often produce a plastic or chemical smell for the first few cycles. This is the manufacturing oils, protective coatings, and new plastics inside the machine off-gassing when first heated. It usually disappears after 2–5 cycles and is not harmful.

Is Burnt Plastic in a Dishwasher Toxic?

Small amounts of melted plastic on the heating element produce fumes that, while unpleasant, are not typically dangerous in a well-ventilated kitchen. However, avoid running the dishwasher if large amounts of plastic are melted onto the element, and ventilate your kitchen well by opening windows and doors. If you're concerned, remove the melted plastic residue before running another cycle.

How to Get Rid of the Burnt Plastic Smell

• Remove all melted plastic residue from the element and tub surfaces.
• Run an empty cycle with 1 cup of white vinegar placed in the bottom of the dishwasher.
• Follow with a cycle using baking soda sprinkled across the bottom of the tub.
• Leave the door open between uses to air out the interior.
• If smell persists after 3–4 empty cycles, the heating element itself may be damaged and need replacement.

3. Electrical/Wiring Problem

If the plastic smell is accompanied by a burning or acrid electrical odour (rather than purely plastic), and you cannot identify any melted item, stop using the dishwasher immediately. An electrical burning smell can indicate a wiring fault, failing motor, or overheating component — all of which require a qualified technician.

Preventing Plastic from Melting in Your Dishwasher

• Place all plastic items on the top rack only — further from the heating element
• Secure lightweight plastic lids and containers so they can't fall through
• Check that all items are dishwasher-safe before loading
• Don't overcrowd racks — items that are too tightly packed can dislodge during the cycle

Which Plastics Are Dishwasher Safe?

Not all plastics behave the same in the dishwasher. The safest way to know is to look for the dishwasher-safe symbol (a cup and water droplets, sometimes with a rack icon) or check the bottom of the item for a resin code:

• Polypropylene (PP, #5): Generally dishwasher safe. Used in most food storage containers, straws, and some cups. Heat resistant up to around 250°F.
• High-density polyethylene (HDPE, #2): Usually safe on the top rack. Used in cutting boards, milk jugs repurposed as containers.
• Tritan (copolyester): Specifically engineered to be dishwasher safe. Used in Nalgene bottles, some water bottles, and premium food storage.
• Polycarbonate (PC, #7): Technically survives dishwashers but degrades over time and can leach BPA. Top rack only if at all — consider replacing with Tritan alternatives.
• Polystyrene (PS, #6): Not dishwasher safe. Warps easily in hot water. Often used in disposable cups and foam containers — never belongs in a dishwasher.
• PVC (#3) and low-density PE (#4): Not dishwasher safe. Will warp, cloud, or crack.

Top rack vs bottom rack: The bottom rack sits closest to the heating element and gets the hottest. Always place plastics on the top rack where they're farther from direct heat, even if the item is labeled dishwasher safe.

When in doubt, hand wash. If an item has no dishwasher-safe marking, assume it isn't. The cost of replacing a warped container is much lower than diagnosing a burnt-plastic smell caused by a melted item on the heating element.