BoilerFaultCodesIntergas f016 Fault Code
Also written as F016 — same fault.
The Intergas f016 fault code means: your boiler has detected that a vital temperature sensor is incorrectly fitted or has become detached, preventing the system from monitoring heat levels safely.. It appears on 4 Intergas models in our database.
Technical description: Mounting fault S3
What causes the Intergas f016 fault?
This fault occurs when the S3 sensor, which monitors the temperature within the heat exchanger, is not properly seated against the pipework or has physically detached. The most common reason is a loose or damaged retaining clip, but it can also be triggered by a faulty wiring connection that prevents the boiler's computer from receiving an accurate reading.
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 f016 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Intergas f016 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