E6
Worcester Bosch
Hot Water Temperature Sensor (DHW NTC) Fault
Boiler displays E6, hot water temperature unstable or boiler shuts down when hot water is drawn.
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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 on plate heat exchanger, Loose or corroded NTC connection, Faulty PCB sensor input
How to Fix / Troubleshooting
Safety first: Isolate electrical power before removing the case. Water may be hot; allow to cool.
Engineer steps:
- Locate the DHW NTC sensor on the domestic hot water outlet or plate heat exchanger.
- Measure resistance at ambient and during hot water demand; compare with NTC chart.
- Inspect wiring and connector for signs of moisture or corrosion; clean and secure.
- Replace the DHW NTC if readings are incorrect or intermittent.
- If sensor and wiring are good, test the PCB and replace if necessary.
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Repair Difficulty
Medium
3/5
Required Part
DHW Temperature Sensor (NTC)
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