How much does it cost to fix Heatline error code Flashing 80?

Typical repair cost for the Heatline Flashing 80 fault is £80-120 including labour.

Flashing 80 High

Heatline Flashing 80 Fault Code

Q: What does the Heatline Flashing 80 fault code mean?

Your boiler has stopped working because the water pressure inside the heating system has dropped too low to operate safely.

Also written as FLASHING80 — same fault.

The Heatline Flashing 80 fault code means: your boiler has stopped working because the water pressure inside the heating system has dropped too low to operate safely.. It appears on 2 Heatline models in our database.

Technical description: Low System Pressure

Typical repair cost £80-120 (including labour)

DIY fix possible

Locate the external filling loop, which is usually a flexible silver hose under the boiler connecting two pipes.Open the attached valves slowly to allow mains water into the system until the pressure gauge reads between 1.0 and 1.5 bar.Close both valves tightly and ensure no water is leaking from the connection points.

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Heatline models that show the Flashing 80 fault code

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

Source

Heatline Flashing 80 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