Why Is My Dishwasher Tablet Not Dissolving?

If your dishwasher tablet isn’t dissolving properly, your dishes may come out dirty or streaky. This issue is often linked to water temperature, dispenser blockages, or detergent quality. Here’s what to check.

1. Water Temperature Is Too Low

Dishwasher tablets are designed to dissolve in hot water. If your appliance doesn’t reach around 50–60°CDishwashers typically need water at 50–60°C for detergent tablets to dissolve effectively., the tablet may remain partially intact. Run the hot tap before starting the cycle to preheat the incoming water.

2. The Dispenser Door Is Blocked

If a large pan, plate, or cutlery item blocks the detergent flap, the tablet can’t drop into the wash. Always check the dispenser has a clear path before starting your cycle.

3. Spray Arms Are Clogged

Spray arms distribute water evenly. If their jets are blocked by food debris or limescaleA hard, chalky deposit caused by calcium and magnesium in water, which can block jets and heating elements., the water flow may not reach the detergent dispenser properly. Clean them regularly with a soft brush or vinegar rinse.

4. Using the Wrong Detergent Type

Not all tablets dissolve at the same rate. Eco or quick wash cycles use cooler water and shorter times, which can make some tablets less effective. Try switching to a faster-dissolving brand or use powder detergent instead.

5. The Tablet Is Old or Damp

Moisture can cause tablets to clump or harden, making them difficult to dissolve. Store them in a cool, dry place away from steam and humidity.

Quick Fix Tips

• Run a hot service wash with dishwasher cleaner to clear buildup
• Check the dispenser flap opens fully during a cycle
• Use high-quality tablets suited to your wash cycle type
• Ensure spray arms spin freely and are debris-free

By identifying the cause, you can restore your dishwasher’s performance and enjoy spotless, streak-free dishes again.