Caple oven trips the household circuit breaker or RCD when heating is started.

Safety first: Do not repeatedly reset a tripping breaker. Isolate the oven and confirm no power is present before inspection.

• Visual inspection: Remove rear cover and inspect all wiring to elements, fan, and lamp for signs of chafing, burning, or contact with sharp metal edges.
• Insulation test (if available): Using an insulation tester (megger) at appropriate voltage, test each element from terminal to earth. Any low resistance indicates leakage; replace the element.
• Dry moisture: If the oven has recently been steam-cleaned or flooded, allow it to dry thoroughly for 24–48 hours before retesting.
• Check mains filter: Inspect the mains interference filter for cracks or burn marks. Replace if suspect.
• If unsure: Because this involves mains safety and potential electric shock risk, consider using a qualified appliance technician for diagnosis and repair.