Heatrae Sadia digital water heater shows E14 and does not recognise flow changes correctly.

Safety first: Isolate electrical power and close the cold water isolation valve before removing any hydraulic components.

Steps to address E14:

• 1. Clean inlet filter: Remove and clean the inlet filter to ensure debris is not reaching the turbine.
• 2. Access turbine sensor: Remove the cover and locate the turbine flow sensor assembly. Carefully remove it according to the service manual.
• 3. Descale and clean: Rinse the turbine under clean water. If limescale is present, soak in a suitable descaling solution approved for potable water, then rinse thoroughly.
• 4. Inspect O-rings: Check and replace any O-rings or seals disturbed during removal to prevent leaks.
• 5. Refit and test: Reassemble, restore water and power, and run a hot tap. If E14 persists, replace the turbine sensor assembly.