Low
268 on Worcester Bosch 35 RSF

Your boiler is currently running a self-diagnostic check, which is usually a temporary sequence that occurs during startup or after a reset.

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

Component test phase

DIY fix possible

Wait for the sequence to complete (usually 2-5 minutes)If it persists, press the reset button onceEnsure power to the boiler is stable and not being interrupted

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