E11
Atlantic
DHW Flow Detection Fault
Boiler displays E11, no hot water in combi mode, heating may still work.
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Stuck DHW flow sensor or turbine, Blocked inlet filter on cold water, Limescale buildup in DHW flow path, Faulty DHW microswitch
How to Fix / Troubleshooting
Safety: Turn off power and close the cold water isolation valve to the boiler before removing any DHW components.
- Check water flow: Open a hot tap fully. If flow is weak, check the main stopcock and any isolation valves to the boiler.
- Clean inlet filter: Many Atlantic combi boilers have a mesh filter on the cold inlet. Isolate, remove, and clean this filter of debris.
- Exercise the DHW flow sensor: On some models, the DHW flow sensor/turbine can be removed and cleaned of limescale. Only do this if you are competent and can reseal correctly.
- Call a technician: If E11 persists, the DHW flow sensor or microswitch may need replacement and the DHW circuit descaled.
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Repair Difficulty
Medium
3/5
Required Part
DHW Flow Sensor / Turbine
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