BoilerFaultCodesRemeha é5 Fault Code
Also written as 5 — same fault.
The Remeha é5 fault code means: your boiler is failing to detect a flame after several attempts, which means it has locked itself out for safety.. It appears on 3 Remeha models in our database.
Technical description: No ionisation or ionisation failure more than 5 times during one heat demand.
What causes the Remeha é5 fault?
This fault occurs when the boiler tries to light the gas but cannot detect a steady flame to confirm it is safe to continue. The most common reasons are worn-out sensors that can no longer 'see' the flame, a faulty ignition spark, or an issue with the gas supply preventing the burner from firing up correctly.
DIY fix possible
Check if other gas appliances like a hob are working to ensure gas is reaching the propertyPress the 'Reset' button on the control panel to see if the boiler restartsIn freezing weather, check if the white plastic condensate pipe outside is frozen and thaw it with warm water
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Gas Safe Register →Remeha models that show the é5 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Remeha é5 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