DE DIETRICH AD281 - Manual (Page 25)

Code Faults Description Checking / solution
D20 SOL COM.FAIL Interruption in communication between the SCU PCB and the solar control system
4 Contact the professional who takes care of maintenance of the appliance
D50 DEF.COM.OTH Break in communication between the iSystem
module and the boiler control panel.
4
Contact the professional who takes care of
maintenance of the appliance.
D51 DEF XX:SEE BOIL. An error is displayed on the boiler control panel. 4 Refer to the boiler's installation and service
manual.
VM iSystem 4. Troubleshooting
17/11/2011 - 300028026-001-A 24