Boiler shows E6, often related to flow temperature sensor or overheat on some Worcester Bosch models.

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.

Possible Causes

Faulty flow NTC sensor, Poor circulation due to pump or blockage, Air in system, Wiring fault to sensor

Safety first: Turn off power and let the boiler cool before touching pipework.

Check pressure and bleed: Ensure system pressure is correct and bleed radiators to remove trapped air.
Reset boiler: After restoring pressure and bleeding, reset the boiler and monitor operation.
Visual check: Look for damaged or loose sensor wiring on the flow pipe leaving the boiler.
Engineer tasks: A professional should test the NTC sensor, verify pump operation, check for sludge/blockages, and replace the sensor or pump as required.

Hard 4/5

Flow Temperature Sensor (NTC)

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