E06 Medium

Heatline E06 Fault Code

The Heatline E06 fault code means: your boiler is struggling to accurately measure the temperature of the water used for your taps and shower, so it has stopped providing hot water to prevent overheating.. It appears on 5 Heatline models in our database.

Book a service

This fault should be looked at by a Gas Safe engineer within the next week or two. It may get worse if left.

Technical description: Domestic hot water sensor fault
Typical repair cost £120-180 (including labour)

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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Heatline models that show the E06 fault code

Click a model for the full fault code list and model-specific repair notes.

Source

Heatline E06 fault code information on this page is sourced and cross-checked against the official Heatline service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026