What should I do if an error occurs and requires a reset?
In case of an error message such as E24 or E25, reset the error by pressing the Back button for about five seconds during operational status. The LED indicator will flash green twice to confirm; you can also use ERROR RESET from SERVICE menu (page 39). If issues continue, contact an installer or service organization.
From the official Itho Daalderop 120l Smart Upp Boiler manual, page 38
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