Dishwasher does not heat the water, cycle may run long and end with F07 or 7 flashes. Dishes come out cold and poorly cleaned.

Safety: Disconnect mains power and allow the machine to cool fully before touching the heater or sump.

Access the heater:

• Most Indesit dishwashers use an inline flow‑through heater mounted on the circulation pump assembly.
• Remove the lower front or side panel to expose the pump and heater housing.

Visual and electrical checks:

• Inspect heater terminals and wiring for signs of overheating or loose spade connectors.
• With a multimeter, measure resistance across the heater terminals. A typical value is 20–30 Ω; an open circuit indicates a failed element.
• Check any inline thermal cut‑out or thermostat for continuity.

Control board relay:

• Access the control board in the door and inspect the heater relay area for burnt tracks or discoloration.
• If the relay is visibly damaged, the PCB should be replaced.

Reassembly:

• Replace the heater assembly if open or leaking, ensuring all seals and clamps are correctly fitted.
• Reconnect wiring, refit panels, restore power, and run a hot cycle to verify heating.

Because the heater circuit is high‑power, if you are not confident with electrical testing, contact a qualified technician.