BoilerFaultCodesWarmhaus E15 Fault Code
The Warmhaus E15 fault code means: your boiler has detected a problem with the fan that clears exhaust gases, preventing the unit from starting safely.. It appears on 1 Warmhaus model in our database.
Technical description: Fan error – a fan being blocked or excessive external air pressure.
What causes the Warmhaus E15 fault?
This fault occurs when the boiler's control system detects that the fan is not spinning at the correct speed or has failed to start entirely. The most common reasons are a physical blockage in the flue pipe, a build-up of debris inside the fan casing, or an electrical failure in the fan motor itself.
This error can occur during periods of high winds, as extreme gusts blowing directly into the external flue terminal can create enough back-pressure to prevent the fan from spinning correctly.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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Gas Safe Register →Warmhaus models that show the E15 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Warmhaus E15 fault code information on this page is sourced and cross-checked against the official Warmhaus service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026