What should I do if my frother isn't working properly?
If the light on the frother base is pulsing, you may be trying to froth while the coffee maker is brewing—wait until the brew cycle completes and frothing will start automatically. If all lights on the frother base are flashing, check that there is milk in the frother, the whisk is correctly placed, and the frother is properly seated on the base. If you're still having issues, call Customer Service at 1-800-361-5628 for help. (Page 5)
From the official Keurig K Cafe manual, page 5
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