Heatrae Sadia electric water heater shows E09 and does not heat; sometimes trips the breaker.

Safety first: Isolate power at the consumer unit and verify. Water heaters contain live terminals even when not heating.

Steps to address E09:

• 1. Visual inspection: Remove the cover and locate the heating element terminals. Look for signs of overheating, melted insulation, or loose screws.
• 2. Tighten connections: If terminals are loose, tighten them to the manufacturer’s torque specification. Do not overtighten.
• 3. Insulation test (for competent persons): Disconnect the element leads and perform an insulation resistance test between each terminal and earth. Low resistance indicates a failed element that must be replaced.
• 4. Replace element: Drain the heater or cylinder as required. Remove the element flange or cartridge and fit a genuine Heatrae Sadia replacement with a new gasket. Refill, check for leaks, and reconnect wiring.
• 5. Test: Restore power and monitor operation. If E09 persists with a new element, the control PCB or wiring harness may be faulty and should be checked by a professional.