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

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.

Possible Causes

Failed Dimplex DHW NTC sensor on hot water outlet, Loose connector between DHW sensor and Dimplex PCB, Scale build-up around sensor pocket affecting readings

How to Fix / Troubleshooting

Safety first: Turn off power and allow hot water pipework to cool before touching any components.

What you can do:

Reset the boiler: Perform a full power cycle and reset via the Dimplex control panel.
Check hot water flow: Ensure adequate flow at taps; very low flow can cause temperature instability and error codes.

Technician tasks:

Test the Dimplex DHW NTC sensor resistance and replace if faulty.
Inspect for limescale build-up in the DHW outlet and sensor pocket; descale or replace affected parts.
Verify correct wiring between DHW sensor and Dimplex PCB.

Repair Difficulty

Medium 3/5

Required Part

Dimplex DHW NTC temperature sensor

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