BoilerFaultCodesIntergas E13 Fault Code
The Intergas E13 fault code means: your boiler has detected a problem with the sensor that monitors exhaust fumes, causing the unit to shut down for safety.. It appears on 6 Intergas models in our database.
Technical description: Flue gas sensor S4 defective
What causes the Intergas E13 fault?
This fault occurs when the boiler's internal safety system loses communication with the sensor that monitors the temperature of the exhaust fumes. It is usually caused by a physical failure of the sensor's internal components or loose electrical connections in the wiring harness. When the boiler cannot verify if the exhaust gases are at a safe temperature, it will stop running immediately to prevent potential heat damage.
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 E13 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Intergas E13 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