BoilerFaultCodesHeatline F.28 Fault Code
Also written as F28 — same fault.
The Heatline F.28 fault code means: your boiler has tried to light itself three times but failed, meaning your heating and hot water have stopped working.. It appears on 2 Heatline models in our database.
Technical description: After three successive failed ignition attempts, the system switches to fault mode.
DIY fix possible
Check if your gas meter has credit and the isolation valve is open.Ensure other gas appliances in your home, like a hob, are working correctly.Press the Reset button on the boiler control panel to clear the lockout.
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 F.28: 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 F.28 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Heatline F.28 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 31 August 2026