Hi! I got a new Bunn VPR last week but did not run water through it because I was waiting for our maintenance guy to install a GTRI outlet for it. When he installed the outlet on Saturday he plugged in the machine and left it on (no water in it) all weekend. I just ran water through it and that works fine. but when left alone the water seems to boil in the tank. Is it broken? Is there something I can do?

that is heating element problem...it is repairable but not for DIY..

The bunn VPR is a gravity brew system what you put in if the tank is full is what you will get out. So pour water in until it flows out the sprayhead, then turn machine on, when it heats up fill up a carafe with water (1.9Liters) and put in your filter with water and brew. It is a good idea to pour water in every morning to make sure tank is full especially if you are not using brewer on the weekends.

That is one of the best coffee makers ever.It will last for a long time.Yes it is ok to leave it unplugged.Do not ever leave an empty pot on a burner that is on.Once a month,put 1 cup of white vinegar where the water goes,and run the machine.This will clean the inside.After you use the vinegar,run one pot of clean water through the machine.

Try running a quarter-pot 50/50 solution of white vinegar and cold water through to clean out calcium deposits in the pump system. Use a clean filter to catch the pumped debris. When pumped through, let cool somewhat, and reuse the cold mixture again twice more. Pour out the vinegar solution and run several cold water loads through to wash out the taste. Hope this helps!

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.

You may not have enough water in the tank.
Follow these steps

1. With the coffee pot unplugged, fill your resevoir/tank until water begins pouring out of your sprayhead and brew basket.
2. Wait for the water to finish dripping then plug in your Bunn.
3. Let your Bunn warm up for at least 8 minutes.
4. Run a test cycle with clean water, remembering to use the water pitcher provided for this purpose, while leaving your empty pot on the burner beneath the brew basket.
5. If your cycle completed, and your coffee pot is filled to the desired level you are ready to make coffee.

Remember that these Bunn models have no water filter installed, so, the cleaner the water the better tasting the coffee.

Possible the hi-limit turned off the heater, the thermostat is not working or the elements are damaged, or the inline thermal fuse is damaged.

need diogram for bun B10-W leaks water

Test that you have it plugged into an operating outlet.... Check that all of the switches are "on" (the warmer and the heater switches). If this doesn't help, you'll need to unplug the unit and test the switch and element for proper operation. Both can be tested for continuity. If they all test good, then I'd suspect the thermostat.
Good luck and best regards, --W/D--

Hello. I do not see a VPR manual with automatic functions, so your unit is not a VPR. Either way, it sounds like you have a scale build up on your level probe, causing the machine to over brew, until it can "see" the water again. This would require taking the top off, locating the probe, unplug please, remove by pulling out, annd cleaning the part that sits in the water. The other thing is you accidentally changed the time setting, here is a link to the manual,
http://www.bunn.com/pdfs/commercial/manuals/10179.0000.pdf

use the instructions to reset the whole time cycle on page 6, setting batch size. Then lock the timer to prevent future mishaps.If this is not your manual, but you have a Bunn unit, go to www.bunnomatic.com, and you can find the manuals to the left side of the screen.

Hope that helps, and thank you.