A. Low

Remeha A. Fault Code

Also written as A — same fault.

The Remeha A. fault code means: your boiler is displaying a status code indicating how it has been configured to manage your heating and hot water settings, but it is not currently indicating a system failure.. It appears on 1 Remeha 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: Setting for appliance control (1 X: central heating modulating; 2 X: central heating high/low ext.input; X 0: central heating off, D.H.W.off; X 1: central heating on, D.H.W.on; X 2: central heating on, D.H.W.off; X 3: central heating off, D.H.W.on)

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 A. fault code

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

Source

Remeha A. 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