BoilerFaultCodesIntergas E05 Fault Code
The Intergas E05 fault code means: your boiler has detected that the fan, which safely removes waste gases, is spinning at the wrong speed or has stopped working entirely.. It appears on 6 Intergas models in our database.
Technical description: Fan speed incorrect
What causes the Intergas E05 fault?
This fault occurs when the boiler's main control board loses communication with the fan or detects that it isn't spinning at the required speed to safely expel exhaust fumes. The most common reasons are a build-up of dirt inside the fan housing, a loose electrical connection, or a mechanical failure of the fan motor itself.
This fault can sometimes occur during period of high winds if the air pressure prevents the fan from reaching its starting speed, or after a long summer break when moving parts may have seized.
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 →Intergas models that show the E05 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Intergas E05 fault code information on this page is sourced and cross-checked against the official Intergas service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026