d5 Low

Remeha d5 Fault Code

Also written as D5 — same fault.

The Remeha d5 fault code means: your boiler has temporarily paused heating because it has already reached the temperature you set, but it is currently waiting for a short safety delay before it starts up again.. It appears on 2 Remeha models 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: Control stop from 3 till 10 minutes; set flow temperature (t1) has been reached and the heating demand still exists

Engineer required

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

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Remeha models that show the d5 fault code

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

Source

Remeha d5 fault code information on this page is sourced and cross-checked against the official Remeha service / installation manuals for each affected model.

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