The milk aereator is faulty milk heats up but does not froth, how can i fix it?

Ummn - something in your Q. seems not right. The milk is not heated directly - its only heated by the steam as it passes by (and picks up) by the milk using a venturi effect - same as a spray bottle attached to a garden hose. You say you have froth - but you can only get that if you have steam... (it does not just blow air thru to create bubbles). So froth = steam & steam = heat... so milk must be hot.
Suggest you check manual for the 'heat' settings for your expresso as this may have been changed. While this is adjustable, the milk is not.

Also always heat your cups before using them - the silver cup 'holder' at the top does a reasonable job but boiling water does far better.
Cheers Mike

I don't have an answer but I was glad to see someone else had the problem. So I came on to troubleshoot also and see if anyone else had an answer.

There may be an issue with the milk you are using if your Keurig K cafe frother is only heating milk and not frothing it. There is nothing wrong with your frother.
You must consider changing the milk you are using and hopefully, your problem will be solved. Read this article for complete details on fixing the frother.
Keurig frother not working

I got mine today exact same thing happens... only blue does not warm AT ALL

Brand of milk definitely matters... Here in Canada I used Sealtest 1% when I first used it and the froth was thick light and luxurious. Then one week picked up Neilsen 1% and found it produced absolutely ZERO froth. Back to Sealtest...back to froth. Milk brand matters....but don't know why.

First, check to see if it will pump out steam without a ton of water. If it doesn't, don't use it.

Now, skim milk is terrible for it, the bubbles are too dry and flavorless. Use 2% milk or half-and-half. It should be cold (very cold). I put mine in the freezer in a steel frothing container for 5-10 minutes before use. Just barely submerge the wand (about .25") and turn on the pressure. It should sound like tearing paper (not like blowing bubbles through a straw). Do this until volume increases to around double (if you have a frothing thermometer, it should be around 100 degrees F). Now submerge the wand farther and tilt the cup to create swirling (this is called stretching & sweetens the milk). This should be done until the temperature is around 140-160 degrees F. Done.

If your machine is no good for steam, there's another way: Put milk into a steel cooking pot (I use a saucier for large groups) and put it in the freezer. When very cold (ice forming) put on stove. Whisk briskly while heating up on medium-high. It will create fine foam & stretch the milk at the same time. The bubbles will start big, but become finer as time goes by. I test by stocking my finger in & going until it feels nearly scalding & remove from heat. Just use a ladle for he milk & a spoon for the foam.

It doesn't froth because the air hole in the frother has become plugged with dried milk (cream). There are two types of frother - old one was a black rubber nipple with a stainless 2-3inch air tube rising above the milk. The plastic insert has a pin hole (really about the size of a straight pin!) that clogs. Use a sewing needle or straight pin to clear it.

Ensure first that you are using the steam pipe in the correct way to froth the milk.

If it still does not work, that means that the steamer is not generating enough pressure steam.

This happens either because there is not enough heat, or if you release the steam when pressure is not enough.

If you think you are doing everything in the right way, then contact the company and insist for having the machine fixed or replaced.

Hi,

Have you decalcify the machine, the boiler does not heat up if there is calcium in it.

Does this happen after you make several froths or the first time you start the machine? Try removing the panarello and froth milk that way then see if this is happening too without the panarello. I found that panarellos are great as a "quick learning to froth?- but they do have the tendency to froth milk too much without heating it up ( to the temperature that you like).