E11 displayed; water heater stops after a few seconds of operation

Safety: Turn off power before bleeding or reconfiguring pipework.

• Verify plumbing: Confirm that cold water is connected to the inlet and hot to the outlet as per Dimplex installation diagram. Correct any reversed connections.
• Bleed air: Open several hot taps fully to purge air from the system. Allow water to run until all air is expelled.
• Check outlet restrictions: Ensure thermostatic mixing valves, check valves, and shower cartridges are not blocked or stuck closed.
• Inspect dry-fire sensor: Locate the dry-fire or level sensor on the heat exchanger. Check wiring and seating. Replace if visibly damaged or if the fault persists after plumbing issues are resolved.

Note: Repeated dry-firing can damage the heating element. If the unit has been run without water, have a technician inspect the element and exchanger.