BoilerFaultCodesWorcester Bosch E01612 Fault Code
The Worcester Bosch E01612 fault code means: your boiler has failed to detect a flame and has safely shut down to prevent unburned gas from building up.. It appears on 1 Worcester Bosch model in our database.
Technical description: Flame Sensor + Harness Buccleuch, Ref. BE/3461/SI
What causes the Worcester Bosch E01612 fault?
This fault occurs when the boiler's control board cannot confirm that a flame has successfully lit after an ignition attempt. The most common reasons are a worn-out sensor that can no longer 'see' the flame, a faulty ignition lead, or a loose connection in the internal wiring harness. Because the boiler cannot verify it is burning gas safely, it shuts down as a protective measure.
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 →Worcester Bosch models that show the E01612 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Worcester Bosch E01612 fault code information on this page is sourced and cross-checked against the official Worcester Bosch service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026