BoilerFaultCodesRemeha E08 Fault Code
The Remeha E08 fault code means: your boiler has stopped working because it cannot correctly read the temperature of the water returning to the unit due to an electrical fault.. It appears on 7 Remeha models in our database.
Technical description: Short circuit return sensor: check wiring and sensor.
What causes the Remeha E08 fault?
This fault occurs when the boiler's internal computer loses the ability to safely monitor the temperature of the water coming back from your radiators. The most common reason is that the return sensor has developed an internal electrical failure or the delicate wiring connected to it has become damaged or loose. Because the boiler can no longer verify if the water is at a safe temperature, it shuts down immediately to prevent overheating.
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 E08 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Remeha E08 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