dd.. Low

Ariston dd.. Fault Code

Also written as DD — same fault.

The Ariston dd.. fault code means: your boiler is signalling that it is currently working correctly to heat the water for your taps and shower.. It appears on 1 Ariston model in our database.

Monitor it

This is a minor fault. Keep an eye on it and mention it at your next annual boiler service. Reset the boiler and see if it clears.

Technical description: Domestic hot water, burner on

Engineer required

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

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Ariston models that show the dd.. fault code

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

Source

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

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026