BoilerFaultCodesRemeha E19 Fault Code
The Remeha E19 fault code means: your boiler has detected that water is returning to the unit too hot, which usually means the water isn't circulating through your radiators properly.. It appears on 1 Remeha model in our database.
Technical description: Return temperature too high: check system flow and pump.
What causes the Remeha E19 fault?
This fault occurs when the water coming back into the boiler is nearly as hot as the water leaving it, indicating that heat isn't being transferred to your radiators. The most common reason is a pump failure or a blockage in the pipework that prevents the water from circulating through the house. It can also be caused by a build-up of sludge or debris inside the heat exchanger, which traps the heat inside the boiler.
This fault is more frequent in autumn when heating systems are first turned on after a long summer break, as pumps often seize up during periods of inactivity.
DIY fix possible
Ensure all radiator valves (TRVs) are fully openCheck that the central heating pump is running and not stuckBleed all radiators to remove trapped air that might be blocking water flow
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Gas Safe Register →Remeha models that show the E19 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Remeha E19 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