How much does it cost to fix Halstead error code LED 1: On, LED 2: On?

Typical repair cost for the Halstead LED 1: On, LED 2: On fault is £150-£300 including labour.

LED 1: On, LED 2: On High

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

Q: What does the Halstead LED 1: On, LED 2: On fault code mean?

Your boiler is failing to clear air from the system before starting, which is preventing it from firing up safely.

Also written as LED1ONLED2ON — same fault.

The Halstead LED 1: On, LED 2: On fault code means: your boiler is failing to clear air from the system before starting, which is preventing it from firing up safely.. It appears on 1 Halstead model in our database.

Technical description: Simultaneous: Lighting Sequence-Fan/APS (Check connection & operation)

Typical repair cost £150-£300 (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: On fault code

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

Buckingham 4 Repair: £150-£300

Source

Halstead LED 1: On, LED 2: On 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