The Philips 4400 LatteGo requires the milk container to be correctly attached to its frame. Insert the top of the milk container beneath the hook at the top of the frame, then press the bottom into position until it clicks. Incorrect assembly is a documented cause of milk not frothing.

Separate the milk container from its frame and rinse both components thoroughly under running water. Both parts can also be cleaned in the dishwasher. Milk residue on either component can affect frothing performance. Ensure both parts are clean before reconnecting them.

Slightly tilt the assembled LatteGo container and position it onto the hot-water spout. Press the assembly towards the machine until it locks securely into place. Ensure the milk container and frame are correctly connected before attaching them.

Different milk types produce different quantities and textures of foam. Semi-skimmed cow's milk, full-fat cow's milk and lactose-free milk are specifically identified in the 4400/5500 manual as producing good frothing results. If foam quality is poor, try one of these milk types before investigating a machine fault.

For the best frothing results, use milk directly from the refrigerator. Fill the LatteGo container with enough milk for the selected drink without exceeding the maximum marking. If the milk quantity has been personalised, the amount required may differ from the indication shown on the container.

Once the LatteGo components have been cleaned and correctly assembled, select a cappuccino using the Philips 4400 drink controls and press start/stop. The machine should dispense milk before coffee for this recipe. If frothing remains poor after checking assembly, cleanliness and milk type, further inspection may be necessary.