Boiler displays E06, domestic hot water temperature unstable or not recognised

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

Failed Baxi DHW NTC sensor on plate heat exchanger, Loose NTC connection, Wiring damage between NTC and PCB, PCB sensor input failure

Safety first: Turn off power before any inspection.

User checks:

Power cycle the boiler once to see if the code clears.
Run a hot tap and observe: if the boiler does not respond or temperature fluctuates wildly, the DHW sensor may be faulty.

Professional actions:

A qualified engineer will access the DHW NTC sensor (usually clipped to the plate heat exchanger), test its resistance, and check wiring.
If necessary, they will replace the sensor and verify correct DHW temperature control.

Medium 3/5

DHW NTC Temperature Sensor

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