Question about Bunn-O-Matic Coffee Brewer GRW8

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Water over filling pot

I have a one burner, Bunn A-10 Series direct plumbed coffee maker. The problem is that the pot overfills by about a 1/4 of a cup each time the coffee is made. Is there a way to adjust the water level? I have lost the instruction manual.

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There is a brew timer on the left side of your machine near the heater switch. you need to remove an access panel to access it. turn this down a little, let the water heat up, then try another brew. Adjust as needed, brewing another pot between each setting.

Posted on Feb 13, 2009

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SOURCE: Water over filling pot

The procedure for setup of this coffee maker can be found here -

http://www.bunn.com/pdfs/commercial/manuals/10613.0000.pdf

Please email if you have additional questions.

Posted on Feb 02, 2009

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1 Answer

How do I fix a leaking Bunn Coffeemaker model NHBX-B?


This is a home model pour over. Overfilling is the most common cause of leakage as there is no plumbed in water line. You should only pour in the amount indicated on the decanter. If it is overflowing, check if you have the right decanter as someone may have used an old pot from a larger brewer. Say there was a 12 cup pot around and now you have a 10 cup brewer.
* carefully pour water to the inner fill line. You will probably see a ledge or spill off hole on the inside of the fill tank. Some units will spill out the back, others may spill back into the drip funnel. Note at what point you get near the spill level and note how much is left in the decanter. The amount left is your over flow.
* If you want more accuracy then use a measuring cup and count how many cups are needed to fill the brewer.
* Unplug any brewer that has water coming from the base. Dry up the area and drain the brewer. Dry off and let sit to completely dry out. Refill, note any leaks? If okay then plug in and brew as normal.
* still having problems? Contact your vendor for service.,
Aloha, ukeboy57

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You should check to insure that the tank inside the machine is full of water. Pour in 1 pot of water at a time until you get water to come out of the brew basket. If you haven't done any internal damage it should be ready to brew a pot of coffee inabout 20 minutes.

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Water overfill


The A10 has a semi-sealed tank that keeps +1 pot of water heated and ready to brew. Pouring in a full pot of cold water will fill the top tray and allow a slow trickle of cold water into the top which forces hot water to over flow into the brew basket. This continues until all the cold water drains into the heater tank. So the brew is matched volume per volume. UNLESS the tank was empty or not filled prior to brewing. Follow the brewing instructions from Bunn (on line for *FREE* download at Bunn.com)
* If it leaks (from the bottom) only when you pour in water. Then your pouring it too fast and over flowing the fill tray. slowdown, watch the level in the tray. do not fill past the lid.
* If it leaks just sitting (not brewing) then there is a hole in the tank. Call for service.
* If it leaks after filling the tray half way. then the top of the tank has a leak, loose, cracked, or missing gasket. There is quite a few gaskets on the lid. Call for service.
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Aloha, ukeboy57

PS. Check your using the correct size decanter for this brewer. If it's a 10 cup brewer then make sure all the decanters in the office is also 10 cup. Pouring a 12 cup pot into brewer will have 12 cups of coffee come out (over flowing the 10 cup pot.) Note that not all decanters are made the same size. Other brands may be different. Test by filling a pot with water (from faucet) then pouring directly into pot in question. It should match and not under fill nor over fill.

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

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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.
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Water over filling pot


The procedure for setup of this coffee maker can be found here -

http://www.bunn.com/pdfs/commercial/manuals/10613.0000.pdf

Please email if you have additional questions.

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