Sime water heater shows E15; unit may lock out with an internal leak or condensate issue.

Safety: Disconnect power. Water inside the appliance can damage electronics and create shock risk.

Steps:

• Inspect condensate trap and hose: Locate the plastic condensate trap at the bottom of the heat exchanger. Check for blockages and ensure the drain hose is not kinked or frozen.
• Check for visible leaks: Look around the primary heat exchanger, hydraulic block, and connections for signs of dripping or corrosion.
• Dry the base: If there is water in the base tray, carefully dry it with absorbent cloths. Do not operate the heater until the source of the leak is found.

Professional help: A leaking heat exchanger or hydraulic group must be replaced by a qualified technician. Condensate trap replacement or cleaning beyond basic flushing may also require service.