Defective temperature sensor is my guess, try running white vinegar through it a few times, the sensor may have hard water deposits on it which can alter the readings.
SOURCE: bunn commercial coffee maker plug overheats, no hot water
Most likely this is your heating element, but it could also be your main thermostat
SOURCE: Steamer is not getting hot enough.
Try using the milk clamp on the tube going into the milk.Tightening it will make your milk hotter.
Your steam wand however, is a different problem.
First, check in the programming that the steam temp. is 125 celcius.
If it is, and none of the tubes from the steam wand to the boiler valve are blocked, your boiler temp. sensor may be faulty, in which case, you will need to replace that.
SOURCE: i have a bunn coffe maker, 10 cup that has a top
How old and have your ran vinegar water mixture to clean teh coffee maker? I woould run 1 part vinegar to one part water to clean coffee makers 2 -3 times a year. Here's a vinegar cleaning link.
http://ezinearticles.com/?How-To-Clean-A-Coffee-Maker&id=57769
SOURCE: Our Bunn VPR coffeemaker takes a LONG time to heat
We left vinegar in the coffeemaker overnight. Seems to have done the trick - water is heating up now after 20 or so minutes instead of several hours.
SOURCE: water not hot on Bunn coffee maker
Check the Hi-limit thermostat on top of the tank, then the pressure stat setting and then the inline fuse and then elements.
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