What should I do if the milk is delivering large bubbles or poor froth?

Clean the milk container lid and control dial as described in section “12.10 Cleaning the milk container” and ensure the hot water connection nozzle (A8) is also clean as advised in section “12.11 Cleaning the hot water nozzle”. Additionally, use skimmed or semi-skimmed milk at refrigerator temperature (about 5°C).