LED 4 Low

Ideal LED 4 Fault Code

Also written as LED4 — same fault.

The Ideal LED 4 fault code means: your boiler is receiving power and is currently in standby mode, which is the normal state when everything is functioning correctly.. It appears on 1 Ideal model in our database.

Monitor it

This is a minor fault. Keep an eye on it and mention it at your next annual boiler service. Reset the boiler and see if it clears.

Technical description: Mains electricity on

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 →

Ideal models that show the LED 4 fault code

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

Source

Ideal LED 4 fault code information on this page is sourced and cross-checked against the official Ideal service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026