BoilerFaultCodesHalstead 1 2 3 4 Fault Code
Also written as 1234 — same fault.
The Halstead 1 2 3 4 fault code means: your boiler has failed to ignite because the internal connection responsible for detecting or starting the flame has stopped working correctly.. It appears on 2 Halstead models in our database.
Technical description: No flame Faulty connector
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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Halstead models that show the 1 2 3 4 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Halstead 1 2 3 4 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