BoilerFaultCodesHeatline 80 Flashing Fault Code
Also written as 80FLASHING — same fault.
The Heatline 80 Flashing fault code means: your boiler has stopped working because the water pressure inside the heating system has dropped too low.. It appears on 1 Heatline model in our database.
Technical description: Fault on Low System Pressure
DIY fix possible
Locate the filling loop (usually a silver braided hose under the boiler).Open the valves on the filling loop to allow cold mains water into the system.Monitor the pressure gauge on the front of the boiler until the needle reaches the green zone (typically 1.0 to 1.5 bar).Close both valves tightly and ensure the boiler resets.
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
Gas Safe Register →Avoid the next call-out bill
A cover plan would handle faults like 80 Flashing: no call-out fees, no surprise bills.
Affiliate links. We may earn a commission at no extra cost to you.
Heatline models that show the 80 Flashing fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Heatline 80 Flashing 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 7 July 2026