Question about Bunn BT10B Coffee Maker

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Bunn blows fuses - Bunn BT10B Coffee Maker

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  • Darlabug Mar 19, 2009

    I have the same problem with my bunn coffee maker blowing fuses, and this is the second bunn that I have had that has had the same problem. This coffee maker is only about 4 to 6 months old. I don't understand because my daughters have been using bunn coffee makers for years and they never have a problem with their coffee makers. Can anyone help?

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This is usually caused by the tray where you pour in the water leaking where it mounts down to the tank. it's probably cracked just enough to allow water to seep out, crossing wires on top of the tank, causing a dead short. There is also a seal that goes between the pour-in tray and the tank that sometimes starts to leak. This tray can be replaced if you can find a used machine that doesn't have the same problem. Before you buy one, though, you should take the top of your brewer off, remove the pour-in tray (careful - they get brittle over time) and look on the top of the tank for signs of water seepage. If there are no signs, then your heating element is most likely blown.

Posted on Feb 11, 2009

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When your brewer blows a fuse, it is an indication of an electrical problem with your brewer. Please call customer service at 800-352-2866 with your model and date code for further assistance.

Posted on Jul 07, 2010

  • atbsmmom Jul 07, 2010

    When your brewer blows the fuses, it is generally an electrical problem with the brewer. If you will call customer service at 800-352-2866 with the model and date code we will be happy to help you.

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You didn't mention which fuse it was that blew; I assume you mean a house fuse, not the Bunn's.
Since you mention a fuse rather than a circuit breaker, again, I assume this is the screw-in type that must be replaced each time it fails.
Check your Bunn for the rated power consumption; it should be shown somewhere on the machine and is likely somewhere between 1000 and 2000 watts.  You need to find how much current the machine is drawing.
Divide the given wattage by your line voltage which is probably (if in the US) ~120 Volts. For example: (from the Bunn) 1200 Watts/120 volts = 10 Amperes  
That means that when the Bunn is heating water, it will need 10 amps just for itself.  If, for example, you have a microwave oven using that same fuse that has a rating of 1000 watts power to cook with, it will actually draw ~ 1400-1500 watts from the wall plug.  Again, 1500 Watts/120 volts = 12.5 Amperes
Now we have a total of 22 1/2 amps of current if both are operating at the same time or if any other appliance such as a toaster (also draws a bunch) is being used, you will most likely blow a 20 amp fuse if not instantly, perhaps after a few minutes.
Fuses are designed to blow in a few milliseconds if hugely overloaded or to be patient for a minute or two if the over-current is mild; say 21 amperes.  
Over-fusing may be dangerous since the fuse rating is related to the gauge of wiring in the circuit it protects. This means that you need to move the Bunn to a different circuit so you don't accidentally exceed the fuse rating with two high-powered appliances if turned on together. 

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