PCB REPLACED Low

Ideal PCB REPLACED Fault Code

Also written as PCBREPLACED — same fault.

The Ideal PCB REPLACED fault code means: your boiler has recently had its main circuit board replaced and simply needs to be rebooted to confirm the change.. It appears on 8 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: Restart boiler by pressing RESTART.

What causes the Ideal PCB REPLACED fault?

This notification appears after a new Printed Circuit Board (PCB) has been installed to ensure the boiler’s software correctly recognises the hardware change. It is a safety and configuration step triggered because the boiler needs a manual confirmation to synchronise the new components with the system's memory. Once you press the restart button, the boiler will verify the installation and resume normal operation.

DIY fix possible

Locate the 'RESTART' button on the boiler control panelPress the 'RESTART' button firmly onceWait for the boiler to complete its startup sequence and return to the normal display screen

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Ideal models that show the PCB REPLACED fault code

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

Source

Ideal PCB REPLACED 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