BoilerFaultCodesIntergas f015 Fault Code
Also written as F015 — same fault.
The Intergas f015 fault code means: your boiler has stopped working because its internal temperature sensor is not positioned or connected correctly, preventing it from heating your home safely.. It appears on 4 Intergas models in our database.
Technical description: Mounting fault sensor S1
What causes the Intergas f015 fault?
This fault occurs when the boiler's main internal temperature sensor is not properly attached to the pipework or has disconnected from the control board. The system shuts down as a safety precaution because it can no longer accurately monitor the water temperature leaving the heat exchanger. The most common reasons are a loose mounting clip, a vibrating sensor, or a fault in the wiring harness connecting the components.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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Intergas models that show the f015 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Intergas f015 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 7 July 2026