BoilerFaultCodesHalstead 3 Fault Code
The Halstead 3 fault code means: your boiler has tried to light itself five times without success and has now locked out for safety.. It appears on 1 Halstead model in our database.
Technical description: In the event of failure during an ignition sequence, (5 attempts).
DIY fix possible
Check that your gas emergency control valve is open and that other gas appliances are working.If you have a prepaid gas meter, ensure it has sufficient credit.Press the reset button on the front of the boiler once to restart the ignition sequence.
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 3: no call-out fees, no surprise bills.
Affiliate links. We may earn a commission at no extra cost to you.
Halstead models that show the 3 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Halstead 3 fault code information on this page is sourced and cross-checked against the official Halstead service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026