Display shows “DESCAL” or “DESCALE” and may beep until acknowledged.

Safety first: Unplug the unit before extended cleaning.

• Perform descaling:
  • Fill reservoir with a 1:1 white vinegar and water solution.
  • Run a full brew cycle with no coffee.
  • Let sit 20–30 minutes, then run another cycle.
  • Rinse with 2–3 full reservoirs of fresh water.
• Reset reminder:
  • On many Mr. Coffee models, the DESCAL message clears automatically after a full cleaning cycle. If not, consult the user manual for the specific button sequence (often holding CLEAN or SELECT for several seconds).

Regular descaling every 40–80 brew cycles (depending on water hardness) will prevent this reminder from appearing frequently.