BoilerFaultCodesIdeal LED 2 on PCB 41 lit Fault Code
Also written as LED2ONPCB41LIT — same fault.
The Ideal LED 2 on PCB 41 lit fault code means: your boiler is failing to ignite or stay lit, meaning you will not have any heating or hot water until the issue is resolved.. It appears on 1 Ideal model in our database.
Technical description: Boiler does not light, or lights briefly at the correct burner pressure then goes off
What causes the Ideal LED 2 on PCB 41 lit fault?
This fault occurs when the boiler's control system successfully sends a spark to the burner, but the flame either fails to catch or isn't detected once it has lit. The most common reasons include a worn sensor that can no longer 'see' the flame, a faulty gas valve that isn't releasing fuel, or a build-up of carbon on the ignition components. Because the system cannot confirm a safe, steady flame, it shuts down the boiler for safety.
This fault is more common during the first cold snap of autumn when internal components that have been idle through summer are suddenly required to operate under high demand.
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 2 on PCB 41 lit fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ideal LED 2 on PCB 41 lit 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