LED 1: On, LED 2: Off High

Halstead LED 1: On, LED 2: Off Fault Code

Also written as LED1ONLED2OFF — same fault.

The Halstead LED 1: On, LED 2: Off fault code means: your boiler has failed to light the flame and has turned itself off for safety.. It appears on 1 Halstead model in our database.

Call an engineer soon

Book a Gas Safe engineer within 24 to 48 hours. Your boiler may be unsafe or could break down completely if left.

Technical description: Ignition Lockout
Typical repair cost £120-250 (including labour)

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 LED 1: On, LED 2: Off fault code

Click a model for the full fault code list and model-specific repair notes.

Source

Halstead LED 1: On, LED 2: Off 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 27 April 2026