Low Information
P3 on Worcester Bosch R30 HE Plus

Your boiler is undergoing a startup sequence or a temporary software update and needs time to finish its internal checks.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed

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

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What causes this fault?

These codes appear when the boiler's internal computer is running through its initial boot-up sequence or performing a temporary software update. They are typically seen after the power has been switched off and back on, or following a brief interruption in the electrical supply. It is the system's way of checking all safety sensors and settings before it begins the ignition process.

This code may be seen more frequently during winter months if local power outages or grid fluctuations occur due to heavy storms.

DIY fix possible

Wait for 5-10 minutes for the sequence to completeMonitor the display to see if it transitions to a normal temperature readingIf the code persists for over 15 minutes, try a single reset of the boiler

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