BoilerFaultCodesRemeha e43 Fault Code
Also written as E43 — same fault.
The Remeha e43 fault code means: your boiler's internal computer settings have become scrambled or have fallen outside of their safe operating ranges, causing the system to shut down for safety.. It appears on 5 Remeha models in our database.
Technical description: Parameter limits
What causes the Remeha e43 fault?
This fault occurs when the boiler's internal memory experiences a software glitch or a physical failure of the electronic circuits. It means the control board can no longer verify its own safety settings, so it shuts down the system to prevent any dangerous operation. The most common cause is a failing Printed Circuit Board (PCB) that has lost its stored configuration data.
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 e43 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Remeha e43 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