E13
Stiebel Eltron
Inlet Temperature Too High
Heater shows E13 and shuts down; may be associated with very high inlet temperature or recirculation systems.
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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
Preheated water entering above allowed inlet temperature, Recirculation loop feeding hot water back into inlet, Faulty inlet NTC sensor reading too high, Incorrect plumbing connections (hot and cold reversed)
How to Fix / Troubleshooting
Safety: Turn off power before opening the unit. Be cautious of hot water in the lines.
- Check plumbing: Verify that the cold supply is connected to the cold inlet and hot outlet to the hot side. Correct any reversed connections.
- Measure inlet temperature: Run water at the heater inlet and measure temperature. Ensure it is within the manufacturer’s specified maximum (often around 131°F / 55°C). Adjust upstream heaters or mixing valves if necessary.
- Disable recirculation (if present): If a recirculation system is connected, ensure it is piped according to Stiebel Eltron guidelines so that hot water is not fed directly into the cold inlet.
- Inspect inlet sensor: If inlet temperature is normal but E13 persists, test and possibly replace the inlet NTC sensor as described for E03.
- Reset and test: After corrections, restore power and test. Persistent E13 with normal inlet temperature may indicate a control board issue.
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Repair Difficulty
Medium
3/5
Required Part
Inlet NTC Temperature Sensor / Plumbing Connections
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