LED 3 Low

Ideal LED 3 Fault Code

Also written as LED3 — same fault.

The Ideal LED 3 fault code means: your boiler is currently undergoing a routine internal startup sequence as it receives power, and this light pattern simply confirms it is initializing its control system.. It appears on 3 Ideal models 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: Application of power. Flash > 1/sec in sync with LED 4

DIY fix possible

Wait for the boiler to complete its startup process, which usually takes a few seconds.If the boiler remains in this state for more than a few minutes without starting, turn it off at the fused spur switch for 30 seconds.Turn the power back on to force a fresh restart.

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Ideal models that show the LED 3 fault code

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

Source

Ideal LED 3 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 7 July 2026