BoilerFaultCodesRemeha C7 Fault Code
The Remeha C7 fault code means: your boiler is continuing to run its internal pump after you have finished using hot water, which is often caused by a stuck internal valve or a sensor error.. It appears on 2 Remeha models in our database.
Technical description: Boiler pump is running after heating DHW
What causes the Remeha C7 fault?
This fault occurs when the boiler's internal computer thinks the hot water is still being heated even after you have turned the tap off. The most common reason is a mechanical failure in the diverter valve, which gets stuck and falsely signals that water is still flowing through the system. This causes the pump to keep running as a safety measure to dissipate heat that isn't actually needed.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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Gas Safe Register →Remeha models that show the C7 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Remeha C7 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 27 April 2026