27 Low

Intergas 27 Fault Code

The Intergas 27 fault code means: your boiler has lost connection to its outdoor thermometer because the wiring has developed a fault or been damaged.. It appears on 3 Intergas models in our database.

Monitor it

This is a minor fault. Keep an eye on it and mention it at your next annual boiler service. Reset the boiler and see if it clears.

Technical description: Shortcut outside sensor

What causes the Intergas 27 fault?

This fault occurs when the electrical connection to your outdoor temperature sensor is interrupted by a short circuit. The most common reasons are water getting into the sensor housing or the external wiring being accidentally damaged or pinched against the wall.

This issue is more frequent during periods of heavy rain or driving wind, which can force moisture into electrical connections that aren't perfectly sealed.

Typical repair cost £70-130 (including labour)

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 27 fault code

Click a model for the full fault code list and model-specific repair notes.

Source

Intergas 27 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