DeDietrich C 330 ECO Installation, User And Service Manual page 12

2. Safety instructions and recommendations C 330 ECO - C 630 ECO
Only remove the casing for maintenance and repair operations. Put
the casing back in place after maintenance and repair operations.
Instructions stickers
The instructions and warnings affixed to the appliance must never be
removed or covered and must remain legible during the entire lifespan
of the appliance. Immediately replace damaged or illegible
instructions and warning stickers.
Modifications
Modifications may only be made to the boiler after the written
permission of De Dietrich Thermique to do so.
10 31/05/2012 - 7600532-01