BoilerFaultCodesIntergas F027 Fault Code
The Intergas F027 fault code means: your boiler is having trouble reading the outside temperature because the sensor or its wiring has developed an electrical fault.. It appears on 5 Intergas models in our database.
Technical description: Short circuit of outdoor sensor S6.
What causes the Intergas F027 fault?
This fault occurs when the boiler's control system detects an abnormal electrical signal, suggesting that the wires for the outdoor temperature sensor have touched each other or the sensor itself has failed internally. The most common reason is water ingress into the sensor casing or physical damage to the cable running along the outside of your property. Without an accurate reading, the boiler cannot adjust its efficiency based on the weather conditions outside.
This fault is more common during autumn and winter when heavy rain or frost can penetrate the sensor housing and cause an electrical short.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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Gas Safe Register →Intergas models that show the F027 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Intergas F027 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