!!
critical Itho Daalderop
Error Code E15
Heater selection error — incorrect control board or identification resistor
? What Causes This
Wrong configuration resistor on board.
✓ How to Fix It
Reset the issue and replace faulty components as necessary.
Source: page 40 of the official manual
From the manual
This error code appears in:
Itho Daalderop 120l Smart Upp Boiler