How much does it cost to fix Halstead error code LED 1-2-3-4 (●●◯●)?

Typical repair cost for the Halstead LED 1-2-3-4 (●●◯●) fault is £150-300 including labour.

LED 1-2-3-4 (●●◯●) Emergency

Halstead LED 1-2-3-4 (●●◯●) Fault Code

Q: What does the Halstead LED 1-2-3-4 (●●◯●) fault code mean?

Your boiler has detected an internal safety error where it thinks a flame is present when it should be switched off, causing it to lock itself out to prevent a hazard.

Also written as LED1234 — same fault.

The Halstead LED 1-2-3-4 (●●◯●) fault code means: your boiler has detected an internal safety error where it thinks a flame is present when it should be switched off, causing it to lock itself out to prevent a hazard.. It appears on 48 Halstead models in our database.

Technical description: Differential check faulty/Flame for 15 seconds - Zero check faulty DHW or CH

Typical repair cost £150-300 (including labour)

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 →

Boiler cover options

Avoid the next call-out bill

A cover plan would handle faults like LED 1-2-3-4 (●●◯●): no call-out fees, no surprise bills.

Approved partner

Domestic Appliance Guard

Unlimited call-outs, 24/7 helpline, no price-hike promise

Get a quote →

Affiliate links. We may earn a commission at no extra cost to you.

Halstead models that show the LED 1-2-3-4 (●●◯●) fault code

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

Source

Halstead LED 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