BoilerFaultCodesBaxi E.04.15 Fault Code
Also written as E0415 — same fault.
The Baxi E.04.15 fault code means: your boiler has stopped working because the pipe that carries exhaust fumes outside is likely obstructed or blocked by debris.. It appears on 2 Baxi models in our database.
Technical description: Flue gas exhaust pipe blocked
DIY fix possible
Check the external flue pipe outside your home for any visible obstructions like bird nests, leaves, or snowEnsure there are no items leaning against or covering the flue terminalGently clear any external debris and restart the boiler using the reset button
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
Gas Safe Register →Avoid the next call-out bill
A cover plan would handle faults like E.04.15: no call-out fees, no surprise bills.
Affiliate links. We may earn a commission at no extra cost to you.
Baxi models that show the E.04.15 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Baxi E.04.15 fault code information on this page is sourced and cross-checked against the official Baxi service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026