E11
Weishaupt
Flow Temperature Sensor Fault (Primary Circuit)
Display shows E11; unit may shut down during operation with no obvious overheating.
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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
Defective flow NTC sensor, Loose or corroded sensor connector, Sensor shorted by moisture, Control board input failure
How to Fix / Troubleshooting
Safety: Isolate power before working on sensors or wiring.
- Locate flow sensor: The primary flow NTC on Weishaupt water heaters is usually clipped to the flow pipe leaving the heat exchanger or inserted into a sensor pocket.
- Check mounting: Ensure the sensor is firmly attached and making good thermal contact with the pipe or pocket.
- Inspect wiring: Check the cable for damage and reseat the connector on the control board.
- Measure resistance: Disconnect the sensor and measure its resistance at room temperature. Compare with the Weishaupt NTC chart. Replace if out of range.
- Board diagnosis: If a new sensor does not resolve E11, the control board may be defective and should be replaced by a professional.
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Repair Difficulty
Medium
3/5
Required Part
Primary Flow NTC Temperature Sensor
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