Fault: Limescale build up. An error code of E12 indicates a buildup of limescale in the heating system. Please purchase the Bosch descaler to remove hard water deposits and limescale buildup.
How to descale a dishwasher?
Remove hard water residue and limescale buildup by using a descaler a few times a year. Simply start the hottest, longest cycle for the empty dishwasher (don’t add any detergent). After 30 minutes add one box of Bosch descaler to the bottom of the dishwasher, then let the cyle continue. After the cycle has finished, run another wash cycle.
Descaling doesn’t clean a dishwasher, it only removes hard water buildup. Use the Bosch dishwasher cleaner a few times a year to remove greasy residues.
Softening salt is a great way to soften the hard water used in your dishwasher. Review your owner’s manual to see if your dishwasher utilizes softening salt. If it does, simply pour the salt into the salt container, which is inside the dishwasher.
For Bosch freestanding, under bench, semi-integrated and fully-integrated dishwashers (including Serie 2, Serie 4, Serie 6, Serie 8).