How do I reset the temperature sensors if they encounter an error?
Resetting a temperature sensor error can be done by pressing and holding the Back button in operational status until the LED indicator flashes green twice. Alternatively, use ERROR RESET from the SERVICE menu (page 35). If the issue persists, replace the faulty sensor or control board as directed in the diagnosis of error messages section.
From the official Itho Daalderop 120l Smart Upp Boiler manual, page 40
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