How much does it cost to fix Intergas error code F16?

Typical repair cost for the Intergas F16 fault is £70-140 including labour.

F16 Low

Intergas F16 Fault Code

Q: What does the Intergas F16 fault code mean?

Your boiler has lost its connection to the outside temperature sensor, meaning it cannot automatically adjust its performance based on the weather.

The Intergas F16 fault code means: your boiler has lost its connection to the outside temperature sensor, meaning it cannot automatically adjust its performance based on the weather.. It appears on 3 Intergas models in our database.

Technical description: Outside sensor open circuit

What causes the Intergas F16 fault?

This fault occurs when the electrical path between the boiler's control board and the external sensor is broken. The most common reasons are a loose connection at the terminal block, damaged external wiring caused by weathering, or a complete failure of the sensor’s internal components.

Typical repair cost £70-140 (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 F16 fault code

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

Source

Intergas F16 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