BoilerFaultCodesRemeha E10 Fault Code
The Remeha E10 fault code means: your boiler has detected that water is the wrong temperature as it enters and leaves the unit, essentially indicating that the water is not circulating through your radiators properly.. It appears on 9 Remeha models in our database.
Technical description: Temperature difference between flow and return too large
What causes the Remeha E10 fault?
This fault occurs when water is unable to move through the boiler fast enough to carry heat away, causing a dangerous temperature buildup. The most common reasons are a failed internal pump that has stopped spinning or a heavy buildup of sludge and debris that is physically blocking the pipework. It can also be caused by air trapped in the system or sensors that are sending incorrect readings to the control board.
This issue often appears when you first turn the heating back on in autumn, as moving parts can seize and debris can settle during the summer months of inactivity.
DIY fix possible
Check that all radiator valves and boiler isolation valves are fully openEnsure your central heating pump is running and hasn't seizedBleed all radiators to remove trapped air that might be blocking water flow
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Gas Safe Register →Remeha models that show the E10 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Remeha E10 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