How much does it cost to fix Heatline error code Flashing 50?

Typical repair cost for the Heatline Flashing 50 fault is £120-£240 including labour.

Flashing 50 High

Heatline Flashing 50 Fault Code

Q: What does the Heatline Flashing 50 fault code mean?

Your boiler has identified a problem with how it moves air and exhaust gases through the system, causing it to shut down for safety.

Also written as FLASHING50 — same fault.

The Heatline Flashing 50 fault code means: your boiler has identified a problem with how it moves air and exhaust gases through the system, causing it to shut down for safety.. It appears on 2 Heatline models in our database.

Technical description: Fault on Air Pressure Switch

Typical repair cost £120-£240 (including labour)

Engineer required

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

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Heatline models that show the Flashing 50 fault code

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

Source

Heatline Flashing 50 fault code information on this page is sourced and cross-checked against the official Heatline service / installation manuals for each affected model.

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