Salter oven shows E20 and trips the household circuit breaker when heating is selected.

Safety first: Do not repeatedly reset a tripping breaker. Disconnect the oven from mains and leave it unplugged until the fault is identified.

• Visual inspection: Remove the rear panel and inspect all wiring for signs of chafing, melted insulation, or contact with sharp metal edges. Repair or replace damaged wiring.
• Check elements for earth faults: With the oven unplugged, disconnect each element. Using a megohmmeter (insulation tester) if available, test between each element terminal and the metal chassis. Low resistance indicates an earth leakage fault; replace the element.
• Dry out moisture: If the oven has been steam‑cleaned or exposed to water, allow it to dry for 24–48 hours in a warm, ventilated room, then retest. Persistent tripping indicates a component fault.
• Inspect mains filter: Check the mains interference suppressor for cracks or burn marks. Replace if suspect.

Warning: Earth leakage faults can be dangerous. If you are not experienced with insulation testing, contact a qualified technician.