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Permalink Reply by Scott on September 7, 2011 at 9:24pm

The loud boiling sound could be scale build up on the elements.

What model do you have?

While Bunn electronics are notorious for failure, I haven't seen over temping as a common problem, unless there's a been a component failure - and then it just over temps all the time.

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Permalink Reply by Benjamin Turiano on September 8, 2011 at 8:33am

We have an HX5 water tower. I was looking through the manual, and I am guessing maybe the steam sensor is broken? Or some other electronic. I'd be surprised if it was scale build up since we have only been using the tower for 4 months, and all the water going through is pretty substantially filtered.

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Permalink Reply by Scott on September 8, 2011 at 2:45pm

Where are you located and what does "pretty substantially filtered" mean?  I ask cause I have customer who's Fetco needs descaling every three weeks.  Filtered and adequately softened are not necessarily the same thing. Have you had the water tested? What's the TDS and Hardness?  Four months is more then enough time to scale the element and cause a boiling noise. It doesn't take much.

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Permalink Reply by Brady on September 8, 2011 at 3:12pm

1. How old is the unit?

2. What is your set temp?

3. What is the temp of water you are actually getting (measured with properly calibrated thermometer)?

4. Does that temperature change when you hear and see the strange behavior?

5. Does the unit otherwise appear to be operating normally when it does this?

6. Have you noticed anything else unusual about the unit?

7. What are you using for water conditioning?

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