BoilerFaultCodesRemeha 0 1. Fault Code
Also written as 01 — same fault.
The Remeha 0 1. fault code means: your boiler has lost power to its internal electrical control circuit, meaning it cannot communicate with its parts or operate at all.. It appears on 3 Remeha models in our database.
Technical description: Short-circuit 24V: Check wiring.
What causes the Remeha 0 1. fault?
This fault occurs when there is an electrical 'short' in the low-voltage circuit that powers the boiler's sensors and internal controls. It is usually caused by water leaking onto electrical components or a damaged wire touching the metal casing, which forces the boiler to shut down to prevent damage to the main circuit board.
This issue is slightly more common during the autumn when heating systems are first turned back on, as pinhole leaks or dampness may have developed around the electrical sensors over the summer months.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
Gas Safe Register →Remeha models that show the 0 1. fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Remeha 0 1. 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