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error Itho Daalderop
Error Code B1
Software error — no communication with watchdog processor
? What Causes This
Issue within the software or hardware malfunction of control board.
✓ How to Fix It
Try resetting error, replace HMI controller if issues are persistent.
Source: page 36 of the official manual
From the manual
This error code appears in:
Itho Daalderop 120l Smart Upp Boiler