BoilerFaultCodesRemeha E07 Fault Code
The Remeha E07 fault code means: your boiler is shutting down because the water is not circulating properly through the system, causing the heat to build up too quickly in one area.. It appears on 8 Remeha models in our database.
Technical description: Delta T (Flow - Return) too large
What causes the Remeha E07 fault?
This fault occurs when water is unable to move through the boiler fast enough to carry heat away, causing a dangerous temperature gap between the outgoing and incoming pipes. The most common reasons are a failing internal pump, a build-up of sludge blocking the pipework, or air trapped within the heat exchanger. Essentially, the boiler is producing heat but has nowhere to send it, so it shuts down to prevent internal damage.
This fault is more frequent in autumn when the heating is first turned on after summer, as the pump can seize or 'stick' during the months of inactivity.
DIY fix possible
Check that all radiator valves are fully openEnsure there is enough water pressure in the system (typically 1.0 to 1.5 bar)Bleed all radiators to remove trapped air that might be blocking circulation
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Gas Safe Register →Remeha models that show the E07 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Remeha E07 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