E11
Crown
DHW Temperature Sensor Fault
Boiler shows E11; domestic hot water (DHW) may not function correctly on combi models
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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
Failed DHW NTC sensor, Loose sensor connection on DHW outlet, Scale buildup affecting sensor contact, Damaged sensor wiring
How to Fix / Troubleshooting
Safety: Turn off power and close the cold water supply to the boiler if removing any DHW components.
- Locate DHW sensor: On Crown combi boilers, the DHW sensor is usually mounted on the DHW outlet pipe or plate heat exchanger.
- Inspect wiring and connector: Ensure the sensor plug is secure at both the sensor and control board.
- Check for leaks: Look for any water seepage around the sensor or DHW connections that could damage the sensor.
- Descale (if applicable): Heavy scale in hard water areas can cause erratic DHW temperatures. A professional should descale the plate heat exchanger and verify sensor readings.
- Reset: After inspection, restore power and reset. If E11 remains, replace the DHW sensor.
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Repair Difficulty
Medium
3/5
Required Part
DHW Temperature Sensor
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