Question about Bunn O-Matic 28800-0100 - CDBCF-15 Automatic Digital Coffee Brewer, 3 Lower Warmers, 120V

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Descale bunn cdbcf15 water tank

Water is just dribbling out of the Sprayhead. I took the Sprayhead off but there was no lime deposit. Also took apart from Sprayhead back to the Brew Valve but that was also clean. I've recalibrated, but of course that didn't help as the water just dribbles out. Last time the (expensive) technician came out, he said he used a coat hanger to clean the line out back to the tank but I can't figure out how to do that. Can I just open the water tank lid and add a quart of white vinegar and run it? (This is the unit with 3 lower burners.) Thanks!

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Running white vinegar thru the line will never cause damage ......and actually should help remove mineral deposits clogging the line. If you want you can reuse the white vinegar and run it thru several times till it has completely removed mineral deposits. Once it is cleaned using distilled water will prevent build up.

Posted on Jan 15, 2015

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How to descale Bunn CW15-APS coffee maker

delime the sprayhead and reservoir drain (in the top) with a deliming spring or a screwdriver. to delime the tank, put a half gallon of vinegar in the top and catch the hot water as it comes out of the sprayhead. leave it sit for about 20 minutes and brew at least 8 times (w/o coffee) or until you can no longer taste vinegar

Jun 20, 2012 | Bunn CWTF Coffee Makers & Espresso...


Bunn coffee brewer brews too slow?

lime builds up on the metal surfaces where the hot water cools down or evaporates, such as the sprayhead, the waterline to the sprayhead, the reservoir inlet, or the insides of the tank. the sprayhead and reservoir inlet buildup will restrict flow and extend brew time and may even not brew through all of the grounds. to fix:
1. remove the top of the brewer. the reservoir is right on top and the drain looks like a nut with a hole in it. lime will plug this up. using a deliming spring or even a philipshead screwdriver, push through and twist to get rid of the lime.
2. unscrew and remove the sprayhead and bore the lime out of the holes with a small flathead screwdriver or a paperclip.
3. if necessary, unscrew the reservoir drain nut, place it and the sprayhead in a cup of straight vinegar. for more stubborn lime, use CLR, but wash and rinse thoroughly.
4. if you have a deliming spring, push it through the outlet waterline to the sprayhead all the way past the 2 elbows and pull in and out, removing any lime buildup.
5. rinse parts, reassemble the reservoir, and brew a little without the sprayhead first to get rid of any loose lime. then put sprayhead on and run a test brew. if it brews short or too much, see tip for recallibrating

on Jan 15, 2015 | Bunn CWTF 15-3 Coffee Maker

1 Answer



1 Perform the initial setup on the coffee maker. Make sure the coffee maker is not plugged in. Slide the empty funnel into the funnel guides, fill the decanter with cold water, open the lid and pour water from the decanter into the brewer, put the decanter back on the base, then close the lid and wait three minutes for the internal tank to partially fill. Open the lid, fill the decanter with cold water again, and once more pour the water directly into the brewer. Put the decanter back on the base and wait for water to flow out of the funnel and into the decanter. Once it has stopped flowing, pour out any water that is in the decanted and plug in the coffee maker. Press the on switch to turn the coffee maker on and heat up the water in the tank.

2 Ensure the lid is completely closed. If the lid is open, the Bunn coffee maker will not brew coffee.

3 Check the see how much water is in the water tank. The Bunn coffee maker will not begin brewing coffee if less than 20 ounces (4 cups) of water is present in the water reservoir tank.
4 Delime the coffee maker. Unplug the coffee brewer and allow it to cool down. Remove the sprayhead by turning it by hand and set it aside. Insert the flexible deliming tool into the sprayhead tube until all but two inches are showing. You may need to twist and force the tool to go in. Slide the tool in and out several times to loosen lime buildup.
Check the sprayhead for lime buildup. If there are flakes of minerals, they can be removed with a toothpick. Scrub the sprayhead with soap and water. Rinse the sprayhead with water and replace it in the coffee maker. Pour water into the water tank and turn the coffee maker on, allowing water to run through without making any coffee. This will flush any lime fragments through the system. Empty the decanter


Sep 18, 2011 | Jura Capresso Impressa S90 Espresso...

1 Answer

The water gets hot and does not perk. There is no lime in the tank or tube and I filled it until it ran out. Is the water temp really crucial to make this work? I turned up the thermostat and saw...

Try using a bunn deliming spring.Remove sprayhead and run thru the brew tube all the way into the tank.If the water is hot the brew tube is partially blocked going into tank.

Jan 30, 2011 | Bunn VPR Coffee Maker

1 Answer

The water is coming out of our BUNN very slowly.What is the matter?

Your sprayhead and steel tube which connects to the sprayhead from the tank may have a lime build up. Simply remove the sprayhead and clean it with a wire brush and make sure the holes are clear of any lime or debris. In order to clean the tube which is what the sprayhead screws onto you will need a deliming spring.

Nov 15, 2010 | Bunn (VPRBUNN) 12-Cup Coffee Maker

1 Answer

I have mold or lime deposits where the water goes in on my bunn coffee pot what can i clean it.

For lime deposits, you can use a citric acid based descaler/cleaner solution.

For mould or mildew, wash thoroughly in a mild steralising bleach solution (similar to the type you clean a baby bottle with).

When you've used both, ensure you rinse the machine thoroughly several times before using it.

Good luck!

Mar 25, 2010 | Bunn 10 Cup Home Coffee Brewer

1 Answer

CDBCF15 Brewer seems to have a stuck solonoid - not completely open, or closed. Can it be taken apart and cleaned - or just replaced?

lime and scale can build up in the unit and cause this problem

Best thing to do is replace the solenoid.

Also replace the in-line water filter.
If no filter, it would be best to add one to the water supply line.

Jan 02, 2010 | Bunn CDBCF15, CDBCF35 automatic coffee...

1 Answer

After the Bunn is done brewing it drips clear water for a while.

When it continues to drip, this generally means you have a lime deposit build up in the water tubing. To correct this, if you remove the sprayhead and insert the deliming tool all the way up the hole and twist and turn it 5-6 times, then flush with 2-3 decanters of water, this should fix the problem. If it doesn't, get the model and date code from the bottom of the machine and contact customer service.

Oct 22, 2009 | Bunn 10 Cup Home Coffee Brewer

1 Answer

Bunn perks coffee very slow?

This is generally an indication of a lime build-up in the water tubing. If you take off the sprayhead and insert the metal deliming tool into the water tubing all the way leaving out about 1-2 inches and twist it about 5-6 times, this should remove the lime deposits from the water tubing. Then flush out the machine with 2-3 decanters of water. If this doesn't fix the problem, then call customer service with the model and date code for further assistance.

Aug 01, 2009 | Bunn GR10 Coffee Maker

1 Answer

My Bunn coffee maker is leaking water

Does it leak all of the time or just when you pour it in. There are a couple of solutions. There is a tank inside and a pan that leads the water to the tank. There is a gasket between the basin pan and the tank. It could be leaking from there but that is pretty rare. Generally what happens is that the basin may get chips or scale that builds up around the basin to tank access nut. The nut secures the basin to the tank with a flat,round silicone gasket between them to keep water from leaking. If scale impeads the free flow of water from the basin to the tank the water backs up and will give the impression of a brewer leak. I haven't worked on one in awhile but there are two screws that hold the pour over top to the brewer. The top can carefully be removed and a visual inspection is done (remember to unplug the brewer) to see if the access nut is clear. The lime could be in the nut or just below and inside the 3/8' hole that leads the water to the tank. Bunn makes a delimer spring that is used to clean out the sprayhead that I use to clean that nut. Speaking of sprayhead, if the leak happens during brewing and seems to come from the front take the brewbasket away and run about a half a pot of water through the brewer and see if it comes through the sprayhead's 5 holes. If it dribbles and doesn't fan out into the pot, or tracks along the roof of the brewer and drops down the side or back clean the sprayhead and try again. Also if it is the A10 or B8 I would run your delimer spring through it. If you don't have the spring you can get one at your local Bunnomatic representative's office. Or call Bunnomatic in Springfield, Illinois and they can send you one and instructions of how to use it. The picture of the bunn I am sending you is of a restaurant model but uses a pan just like the smaller bunns. This one is stainless but the principle is the same. The nut right by the 1/4" spicot is the water access nut, just like on yours. They will clog and leak, but I would check your sprayhead and the free flow of water from it before I do anything else. If it isn't either one of the solutions I have spoke about it could be a tank gasket or worse. Rick in Indy91db15f.jpg

Apr 19, 2008 | Bunn GR10 Coffee Maker

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