Question about Bunn-O-Matic Coffee Brewer GRW8
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Posted on Jan 02, 2017
I had the same issue, poured in 8 and out came 6. Here's what I did to clean and fix.
1) Unplug the NHB
2) Remove accessories like the pot and basket
3) Bring NHB over to the sink
4) Snap off the entire top cover (not the swing lid) by starting at the front and lifting upward (the top cover is about 1/4" thick). The back of the top cover will pivot a bit and then pop off exposing the pour reservoir. Remove the flow stopper inside the pour reservoir by lifting it straight up.
5) Place the top cover and flow stopper aside.
6) Remove the brew diffuser (located underneath the top where the brew basket goes. Twist counterclockwise gently but forcefully enough to snap it past the lock tabs which hold it in place. You'll know that it you've done this correctly when it just falls out.
7) Still over the sink, tip the NHB in a fashion where the back side is facing upward and the brew side is facing down into the sink. You'll be holding the NHB horizontally by the top and bottom of the unit. This will allow any water in the tank to pour out the brew spout. Begin to tip the unit as if tipping upside down as this will allow any remaining water to drain out. If this does not work the brew spout hose may be clogged and you can just tip the unit entirely upside down to empty it from the fill hole in the pour reservoir.
8) Return the NHB to the upright position in the sink.
9) Using a scotch brite sponge and some baking soda, clean the inside of the pour reservoir and rinse.
10) Using the tool Bunn provided, clean out the brew spout hose which is located under the brew hat. This is the little hole where the water comes out. If you don't have the tool Bunn provided you could use something like a plastic tie-wrap. Don't use anything metal as the hose you're cleaning is made of plastic tube and could become punctured. Clean this hose for just a minute or two to ensure that there are no significant obstructions.
11) With the NHB upright in the sink, pour a slow stream of hot water from the faucet, about two cups, directly into the fill hole located in the pour reservoir.
12) Tip the unit horizontally, as in step 7, and place the tip of your finger over the pour reservoir fill hole covering it completely.
13) Shake the unit back and forth horizontally so the water in the tank splashes around and frees anything which may be built up in the tank. Some water may splash out of the brew spout hose.
14) Tip the unit as in step 7 to drain the tank water out.
15) Fill a 16 ounce glass with hot water and 2tbsp baking soda, mix and pour into the pour reservoir fill hole.
16) Repeat steps 13 and 14 once.
17) Repeat steps 11 through 14 three times.
18) Clean the pour reservoir cover, swing lid and flow stopper.
19) Put the flow stopper back in place.
20) Attach the top cover.
21) Clean the exterior of the NHB.
22) With the boil and warmer switches off, plug the NHB into the electrical outlet.
23) Turn the boil and warmer plate switches on.
24) Fill the NHB with one pot of cold water and close the swing lid. Wait one minute.
25) Fill the NHB with another pot of cold water. Place the pot on the warmer plate and close the swing lid. If water does not yet come out, fill with one more pot of water.
26) Allow water to drain from brew spout until it stops draining.
27) Empty pot.
28) Fill pot to 10 cup line and pour into the NHB. You should find that the NHB now delivers 10 cups back to the pot. Empty the pot.
29) Clean brew spout diffuser and replace back in the brew hat.
30) Clean the pot, pot lid and brew basket.
31) Wait ten minutes for the water in the tank to boil.
32) Brew your coffee as you normally would.
The only issue I experienced during this process was with the warmer plate switch. It appeared that the light in the switch blew although the warmer plate still warmed normally. Shortly after the water in the tank started boiling the warmer switch light started operating again.
Posted on May 23, 2008
SOURCE: Won't brew a full pot.
well I hope this helps some, i was having a similar problem with my brewstation and decided to take it apart ( why not, it's already broken! ) this machine has seen a year of very heavy use and I could not bring myself to just throw it away. It would take forever to brew and I would have to turn it off and on several times to brew a full pot. I unplugged the machine, emptied out the water and turned it on it's back. Remove the 4 phillipshead screws and the two torx screws from the bottom ( if you dont have torx handy like me just gently pry the two halves apart till the screws pull through- after you have removed the phillips heads!) at this point the bottom will just come right off, no special tricks. You will now see a horseshoe shaped aluminum tube with orange silicone tubes at either ends of it, this is the heatime element. slide the small hose clamps back away from the element on the hoses and pull the hoses off both sides of the element end only, this will require a little elbow grease to do. Now carefully remove the two phillips screws securing the heating element to the maker BE OBSERVANT AS TO HOW THE WASHERS AND SPACERS ARE SECURED and remove them. To give yourself a little room for the element to come further out of the machine also remove the wiring clamp from the inside, it is a white half "c" plastic piece with 2 screws holding it, it is securing about 7 wires down with wire nuts on them. Once this is removed it will give you enough play to pull the heating element several inches away from the machine, do so. Now look inside the tubes of the element and you should see one side looks clear and clean and the other end is probably going to be clogged solid with tan colored gunk, the water could not pass through!. I took a piece of metal coat hangar (all i had around at the time) and bent it to the conture of the element and used it to **** out the element, uncloging it. this takes a little time because the buildup is very hard to break up. Once that is done carefully wash out the element getting all the build up that was broken up out, CLEAN IT GOOD!. The next step is to dry the exterior and make sure all the wiring is dry, try not to wet the wires at the wiring nuts or it may short out. Now re assemble the machine, run cleaner through and enjoy a cup of coffee !!
Posted on Oct 13, 2008
The two most common reasons for overflow or underflow have to do with the carafe lid and the filter basket - they key to smooth flow with this coffee maker is making sure the filter basket and carafe lid are making the proper contact with each other so that the center knob on the carafe lid pushes slightly up on the filter basket spring. Make sure the carafe lid is completely closed. Make sure the filter basket is pushed all the way down. Make sure you are not using the gold tone filter and a paper filter at the same time. For some reason, I get better results when the handle of the carafe is resting against the right side wall. If everything is in place, I would suspect a problem with either the filter basket being clogged or some problem with the carafe lid - call Cuisinart as they should be able to order these parts for you.
Posted on Sep 29, 2009
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