Oven trips the household circuit breaker or RCD as soon as it is turned on or when heating starts.

Safety first: Do not repeatedly reset a tripping breaker. Disconnect the oven and work only when power is off.

• Isolate elements: Disconnect each heating element (grill, bottom, fan) in turn and test insulation resistance between each terminal and earth using a megohmmeter if available. Replace any element with low insulation resistance.
• Inspect wiring: Look for burnt or pinched wires touching the metal chassis, especially near the elements and terminal block. Repair or replace damaged wiring.
• Check mains filter: Inspect the mains interference filter (usually near the terminal block) for signs of burning or cracking. Disconnect and test; replace if shorted.
• Drying: If the oven was recently steam‑cleaned, allow it to dry for 24 hours and retest; moisture in elements can cause temporary leakage.