How much does it cost to fix Alpha error code 16?

Typical repair cost for the Alpha 16 fault is £180-£350 including labour.

16 High

Alpha 16 Fault Code

Q: What does the Alpha 16 fault code mean?

Your boiler has stopped working because the internal fan, which safely helps the system breathe and clear exhaust gases, is not spinning correctly.

The Alpha 16 fault code means: your boiler has stopped working because the internal fan, which safely helps the system breathe and clear exhaust gases, is not spinning correctly.. It appears on 25 Alpha models in our database.

Technical description: Fan fault

What causes the Alpha 16 fault?

This fault occurs when the boiler's control system detects that the fan is not spinning at the required speed to safely clear exhaust gases from the flue. The most common reasons are a mechanical failure within the fan motor itself, loose internal wiring, or a fault on the main circuit board that prevents it from sending power to the fan.

Typical repair cost £180-£350 (including labour)

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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Alpha models that show the 16 fault code

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

Source

Alpha 16 fault code information on this page is sourced and cross-checked against the official Alpha service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026