BoilerFaultCodesRemeha E9 Fault Code
The Remeha E9 fault code means: your boiler has identified an internal electronic fault or has reached an unsafe temperature, causing it to shut down for safety.. It appears on 9 Remeha models in our database.
Technical description: Internal control box error (high limit circuit fault)
What causes the Remeha E9 fault?
This fault occurs when the boiler's internal safety sensors detect that the water temperature has exceeded safe limits or if the main control board has suffered an electrical failure. It is often caused by a lack of water circulation, such as a failing pump or a blockage in the heat exchanger, which prevents heat from being carried away from the unit. In some cases, the error is triggered by a communication fault within the boiler's electronic 'brain' itself.
This issue is more frequent in winter when the system is under high demand and any underlying circulation issues or pump fatigue are pushed to their limit.
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 E9 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Remeha E9 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