BoilerFaultCodesRemeha E02 Fault Code
The Remeha E02 fault code means: your boiler has shut down because it has detected it is getting too hot, usually caused by poor water flow or a lack of water in the system.. It appears on 8 Remeha models in our database.
Technical description: Safety thermostat (STB) active: check the flow/content (low-water protection).
What causes the Remeha E02 fault?
This fault occurs when the internal temperature sensor detects that the water inside the boiler is getting dangerously hot, triggering an emergency shutdown to prevent damage. The most common reason is a restriction in water flow, often caused by a failing pump or a build-up of sludge and debris blocking the heat exchanger. It can also happen if there is an air lock in the system or if the radiators are turned off, leaving the hot water with nowhere to go.
This fault is more common in autumn when heating systems are turned back on after a long summer break, as internal pump components can seize up from lack of use.
DIY fix possible
Check the pressure gauge and top up the water if it is below 1.0 barEnsure all radiator valves and boiler isolation valves are fully openBleed your radiators to remove any trapped airPress the reset button once the boiler has cooled down
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Gas Safe Register →Remeha models that show the E02 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Remeha E02 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