E14
Stiebel Eltron
Air in System / Pressure Sensor Fault
Display shows E14 and unit does not heat; may occur on models with electronic air detection or pressure monitoring.
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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
Air trapped in heat exchanger, Low system pressure, Faulty pressure sensor or switch, Recently drained or newly installed system not fully purged
How to Fix / Troubleshooting
Safety: Turn off power before purging air or opening any internal components.
- Purge air: Open multiple hot water taps fully and allow water to run until all air is expelled and flow is steady. On some models, there may be a manual air bleed screw—follow the manual if present.
- Check system pressure: Ensure building water pressure is within the specified range. Low pressure can prevent proper operation.
- Inspect pressure sensor/switch: Locate the pressure sensor or switch inside the unit. Check wiring connections and look for leaks or corrosion around the sensor body.
- Reset and test: After purging and verifying pressure, restore power and test. If E14 persists, the pressure sensor/switch may need replacement with the correct OEM part.
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Repair Difficulty
Medium
3/5
Required Part
Water Pressure Sensor / Pressure Switch
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