Oso water heater trips the breaker or RCD when heating is called for.

Safety first: Do not repeatedly reset a tripping breaker. Isolate power and, if necessary, consult a qualified electrician.

• Visual inspection: Remove the front cover and look for signs of water leaks, corrosion, or burned wiring.
• Test element insulation: Disconnect element wires and measure resistance from each terminal to earth. Any continuity indicates a fault; replace the element.
• Check cable condition: Inspect the incoming supply cable and internal wiring for cuts, crushed sections, or melted insulation.
• Dry and seal: If moisture is present, locate and repair the leak (e.g., from T&P valve or joints), dry the area thoroughly, and then retest.