This error indicates limescale buildup in the heat pump, meaning your dishwasher needs to be descaled. Regular use of dishwashers can lead to quick limescale accumulation. Although Singapore's water is considered soft and limescale is less of a concern, we still recommend descaling your dishwasher every 6–12 months with our specialized Quick Descaler. This helps remove any limescale, ensuring your dishwasher works efficiently and effectively, and keeps your dishes clean.