The answer first
Electrical warning signs on a dishwasher come from a small number of places: the supply and its connections, water reaching something that should be dry, and a heating or pump circuit that has broken down internally. None of them is a wash-it-once-more situation. Most of what follows is about conditions the machine is checking rather than parts that have failed. Most of it is settled before a tool comes out.
What you observe
- A hot plastic or burning smell during or after a cycle — Something in the current path is overheating, most often a connection rather than a component.
- The breaker trips when the cycle reaches the heated part — A heating circuit breaking down once it is energised and wet.
- Scorching, melting or discolouration at the plug or outlet — A loose or corroded connection making heat instead of contact.
- NEAR MISS: the machine simply will not start and nothing smells or heats — That is a start or door-latch fault and it belongs on a different page.
Causes, most likely first
- Loose, corroded or overheated supply connection — Most likely here. It leads on a machine of this class because the appliance is built into a run of units and its supply connection is made once, behind a cabinet, and never inspected again. Connections make heat when they stop making contact, and a dishwasher draws hard while heating. This is the most common source of a burning smell and of scorching at a plug.
- Water reaching a component or junction that should stay dry — Next most likely. A slow leak from a hose, a seal or the tub finds wiring below the tub, and the fault appears at the point in the cycle where the leak is worst.
- Heating element or heat pump breaking down to earth — Third in the order. An element that has failed internally trips the protective device the moment it is energised, which is why the fault appears at the same point in every cycle.
- Earth or bonding fault — Then this one. The reason a shock is possible at all.
- Body: The order below is what makes this page worth reading. It is a ranking rather than a measurement, and it carries no numbers because no fact bundle supports any.
Where to start, and what comes next
- Switch the circuit off at the breaker before anything else — Every remaining check is done on a machine with no power to it.
- Look at the plug, socket and visible cable for heat damage — Discolouration, melting and a smell of hot plastic all point to the same place.
- Note exactly when in the cycle the fault appears — A trip during heating, during drain or at fill each convicts a different circuit.
- Body: The order below is written to be done with the machine isolated. Nothing here involves energising the appliance to see what happens.
Owner-side checks, step by step
- Isolate the machine at the breaker and leave it isolated — Do not run another cycle to reproduce the symptom.
- Inspect the plug and socket in daylight — Photograph anything discoloured before you touch it; it is the evidence a technician needs.
Tools: torch
- Write down the point in the cycle at which it happens — Fill, wash, heat, dry or drain: the answer narrows the fault to one circuit.
- STOP. Do not open the machine or test anything live — There is no owner-side test beyond observation for this class of symptom.
Safety, before anything else
Safety
Unplug the appliance or switch off its breaker before removing any panel; a capacitor can hold a charge after the power is off. If you have felt a shock from the machine, leave the circuit off and do not use the appliance again until it has been checked.
When to stop and call
This whole class of symptom is a service call. Isolate the machine and have it checked if it smells hot, trips a breaker, buzzes, scorches a plug or gives anyone a shock. Mention any recent work in the room: taps, cables and hoses are the usual casualties.
Nearest pages of this class
What is deliberately not here
This page is written for the appliance class rather than for one Bertazzoni family or model line. Where a family- or model-specific page exists for your unit it is the more specific answer and should be preferred over this one; the brand and appliance hub linked below routes to everything more specific that exists today.
Links: - [Common BERTAZZONI Dishwasher Problems](/blog/bertazzoni-dishwasher-problems)
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
