BoilerFaultCodesRemeha E33 Fault Code
The Remeha E33 fault code means: your boiler's computer memory has encountered a software error and cannot confirm its safety settings.. It appears on 1 Remeha model in our database.
Technical description: Internal control box failure (parameters): check parameters and reset.
What causes the Remeha E33 fault?
This fault occurs when the boiler's internal computer suffers a communication failure with its memory chip, meaning it can no longer verify its critical safety settings. The most common reason is an electrical glitch or component degradation on the main circuit board that corrupts the saved software parameters. Because the boiler cannot confirm it is operating within safe limits, it automatically shuts down for safety reasons.
DIY fix possible
Press the Reset button on the control panel for three seconds.Wait for the boiler to complete its restart sequence.If the code persists, the boiler requires a professional technician to re-configure the internal settings.
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Gas Safe Register →Remeha models that show the E33 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Remeha E33 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