Question about Bunn GRX-B Original 10-Cup Home Coffee Brewer, Black

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Takes forever to brew coffee

It takes a super long time for the water to run through my bunn coffee maker.... and when it finally does it doesn't run ALL of the water so if i would make a pot up to the 10 mark it woud only go to 6 or 8. and then the coffee tastes horrible...

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Time to clean out the scale.. Like cholesterol in arteries it needs to be removed!
You can get some CLR from hardware store ( calcium and Lime removal substance) Place some in the unit and let it sit fore a while. The run the unit so that the disolver can also attend to the delivery tube. Once it is clear run plain water through it to rinse it. This substance is not harful to health.

Please rate my help++++Thanks for using FIXYA

Posted on Feb 03, 2010

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It could be clogged.. Take out all removable parts and clean well.. Then run a mixture of equal parts od water and vinigar to clean the areas that cant be reached. Repete a few times..

Have a great day

Posted on Feb 03, 2010

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Sounds like calcium build up, You need to descale the machine.

If you look at the grounds on the basket, After the brew cycle is over there is like a hole in the center of the grounds. This happens when there is calcium build up in the tank, tube and or spray head. And takes forever for the brew cycle to end.

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The best way to clean a machine like this out is to actually run a full empty brew of a half water half vinegar solution. This will completely clean out the lines inside the machine and freshen everything up quite a bit. After you run the full empty brew of the solution make sure you run at least 2, maybe 3 full brews of just water on the unit. This will ensure that all vinegar is flushed out of the system, and will help clean it as well. Of course the vinegar won't hurt you if it isn't flushed all the way out, just makes it taste quite funky. But 2 flushes with plain water is almost always enough to completely clean it.

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Please make sure you rate my answer 4 thumbs up, it is extremely important to me. I would be forever grateful if you could do so. If you need more help on this question please just respond to my answer here and I will get right back to you.


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Hello, I am wondering how long between times you are stating, as most Bunn commercial units, stay heating 24/7, and if water is not poured into the machine every couple of days, they will evaporate off water that is held in the tank. This drop in water level can cause short brewing, slow brewing, etc.. as the unit relies on a vacuum or suction to brew properly. You could also have a leaking tank gasket, or brew tube gasket, and it is seeping air into the tank, breaking the vacuum/siphon action, and then seals with water, or expansion at other times. Another cause would be scale build up, and pieces are floating in the tank blocking the flow of water, or your spray head may be clogging/clogged, which minor cleaning should take care of the sprayhead, and tube, or a major cleaning necessary for the tank.

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