BoilerFaultCodesHalstead 3 Fault Code
The Halstead 3 fault code means: your boiler is trying to start up and light the flame, but it is failing to ignite after five attempts and has safely locked itself out.. It appears on 2 Halstead models in our database.
Technical description: Failure during an ignition sequence (5 attempts)
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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 31 August 2026