BoilerFaultCodesRemeha E39 Fault Code
The Remeha E39 fault code means: your boiler has shut down because a safety sensor has detected that it is getting too hot or that there is an issue with the gas supply pressure.. It appears on 6 Remeha models in our database.
Technical description: Safety input blocked (e.g. gas pressure switch / heat exchanger thermostat)
What causes the Remeha E39 fault?
This fault occurs when one of the boiler's crucial safety sensors detects an unsafe operating condition, such as the heat exchanger reaching an excessive temperature or the gas supply pressure dropping too low. It acts as a protective shutdown to prevent internal damage or unsafe combustion. The most common trigger is either a genuine circulation issue causing the unit to overheat or a faulty sensor sending an incorrect signal to the control board.
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 E39 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Remeha E39 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