NOTE - Any buildup on the sprayhead may restrict water flow, and impact your coffee brewing. For consistently great coffee, clean sprayheads weekly. Upon visual inspection it may appear that light passes through all holes in the sprayhead plate, but a thin film of residue can pass light and still impede water flow.
Machine may need to be re-calibrated due to lime build-up. If machine is cleaned and build-up removed, machine must be re-calibrated to achieve desired volumes. Refer to programming manual for calibration routine to verify sprayhead, by-pass and dilution flow rates matches programmed flow rate.
Source: MaintainX (Community Member)