Dishwasher trips the circuit breaker or RCD during operation

Safety first: Do not repeatedly reset a tripping breaker. Unplug the dishwasher and leave it disconnected until the fault is found.

• Inspect for leaks: Check the base tray and internal components for signs of water. Fix any leaks before further testing.
• Test heater to earth: With a multimeter, measure resistance between each heater terminal and earth. Any low resistance indicates earth leakage; replace the heater assembly.
• Check wiring: Look for chafed or burnt wires, especially where the harness passes through metal panels. Repair or replace as needed.
• Evaluate mains filter and motor: Disconnect these components one at a time and test operation (by a qualified person) to isolate the faulty part.
• Seek professional help: Due to shock and fire risk, complex electrical faults should be handled by a qualified technician.