Heater shows F7 and will not fire, often after a power surge or wiring disturbance.

Safety: Turn off power and isolate water supply to the heater. Relieve pressure by opening a hot tap.

• Check for flow: Open a hot tap fully and confirm that water flow is strong. Poor flow may indicate a plumbing restriction rather than a sensor fault.
• Inspect flow sensor: On Ideal water heaters, the flow sensor is usually on the cold inlet or hydraulic block. Check the electrical connector is secure.
• Clean filter/strainer: If accessible, remove and clean any inlet filter or strainer to clear debris.
• Reset and test: Restore water, then power, and reset the unit. If F7 persists, the internal flow sensor assembly may need replacement by a technician.