Cold dishes, two possible causes
A dishwasher that finishes with cold, wet dishes has either lost its heater or was never given hot water to begin with. On a compact machine fed from an under-sink supply, the incoming water temperature is the more common half of that pair, and it costs nothing to test.
What you are seeing
- Dishes are cold and wet at the end of every cycle.
- Plastics never dry, and neither does anything else.
- Grease is left on pans that used to come clean.
- The tub is only lukewarm when the door is opened at the end.
- The cycle takes far longer than it used to.
- Not this fault: Food residue with hot, dry dishes is a cleaning fault - read that page.
- Not this fault: A cycle that stops early is a cycle fault, not a heating fault.
Most likely causes, in Dencrest order
- Incoming water is cold or the hot run is long — Why ranked: First on an under-sink installation. Running the tap hot before starting is a complete diagnostic in itself.
- Heating element or its relay failed — Why ranked: Second. The signature is a machine that runs the full cycle correctly and simply never warms, with no code and no other symptom.
- Thermostat or temperature sensor out of range — Why ranked: Third: a sensor reading high tells the control the water is already hot, so it never calls for heat, and the cycle time often shortens rather than lengthens.
- Rinse aid empty, so drying appears to fail — Why ranked: Fourth. This is a drying complaint mistaken for a heating one, and it is worth excluding before any part is considered.
- Machine set to an eco or cold programme — Why ranked: Last, but genuinely common - a low-temperature programme selected by accident behaves exactly like a heater fault.
What to check, in order
- Run the kitchen hot tap until it is hot, then start the cycle immediately. — Because: If results improve, the fault is the supply run and not the appliance at all.
- Open the door partway through the wash and feel whether the tub is warm. — Because: Warm mid-cycle with cold dishes at the end is a drying and rinse-aid issue rather than a heating one.
- Check which programme is selected and try a standard hot one. — Because: An eco programme explains cold results with a perfectly healthy heater.
- Note whether the cycle has become longer or shorter. — Because: Longer means the machine is trying and failing to heat; shorter means it thinks it is already hot.
Checks you can do safely
- Run the sink hot tap until hot, then start a normal cycle at once. — N: 1 — Tools: None — Time: quick
- Select a standard programme rather than eco or quick and repeat. — N: 2 — Tools: None — Time: one cycle
- Open the door briefly mid-wash and feel the tub and the water. — N: 3 — Tools: None — Time: one cycle
- Fill the rinse aid reservoir and run a further cycle. — N: 4 — Tools: None — Time: one cycle
- Compare the cycle duration with what the machine used to take. — N: 5 — Tools: Timer — Time: one cycle
Before you open anything
Safety
Unplug the appliance or switch off its breaker before removing any panel. A capacitor can hold a charge after the power is off. The heating element sits in the base of the tub and stays hot after the cycle - do not reach in immediately, and never rest plastics against it. Do not open the door fully mid-cycle - hot water and steam come out. Never run the machine with a plastic item resting on the base. Element and relay work means live terminals and is a service job.
When this becomes a service call
The tub stays cold through the whole cycle on a hot supply and a standard programme. The cycle time has changed sharply with no change in use. There is a smell of scorched plastic during the wash. The breaker trips when the heating stage begins.
Nearest pages
What this page does not cover
This is generalized information for dishwashers carrying the Dencrest Limited name. It does not separate machines with an exposed element from those with a flow-through heater, whose failure patterns differ, and it names no model-specific element or thermostat. Where a family- or model-specific page exists it supersedes this one.
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
