Bunn B10 Coffee Maker (Older Model) has began to pass coffee grounds into the serving pot. Have tried different filters and cleaned the spray heat. Any suggestions to prevent these grounds?

A model number would be nice but since all (drip) coffee makers are generally the same in principle I'd wager it's your temperature sensor (underneath the heating plate) or when you plugged it in voltage escaped through the switch causing the unit to be 'on'. Think of a coffee maker like the first 1/2 of a steam engine. Water from the reservoir gets converted into steam by a burner (also warms the heating plate for the carafe) and instead of the steam driving components it gets condensed above the coffee grounds. Without that temperature sensor the burner would be going 'full blast' all the time and burn your coffee which is why a broken sensor will cause a 'no heat at all' issue while a failing one can give false signals to the control board. I hope this narrows down your issue and good luck!

Depends on your model. The smaller pour over units are easy as you prep your funnel with coffee as normal and get a full pot of hot water (just brew the water through the brew head and funnel to fill the pot.) If you have another pot or carafe, air pump pot. Then hold the coffee filled funnel (with coffee filter) over the empty pot and slowly pour the hot water over the coffee grounds. Go slow as you don't want to burn your other hand nor get grounds into the pot if you over fill the filter.
* If this is a 1-1/2 gallon brewer then the missing shower head won't mater that much as most of the 'flavor' is extracted in the first 1/2 gallon with the rest just filling the urn. If you do find the coffee to be weak then perform 3 separate 1/2 gallon brews to allow the grounds to fully soak and extract. Again, you can still do it manually as described above but it does get messy and very slow. (I've done this just to get something out to the customer. Well until I could get the repaired brewer up and running.)
* Most of the Bunn decanter brewers use a quarter size screw on spray head. No real substitute, though you could try a stiff sheet of aluminum foil to cover the coffee grounds in the funnel and poke holes into it. Though more than likely one of the waiters will dump it on the next brew.
* On one occasion (during lunch rush) I had to wait on a repaired urn to heat up but the waiter's needed coffee now! I took a pour over small brewer and made a pot with 1/2 gallon strength coffee and poured it into a larger urn then brewed more 'partial' batches till it was full. Hey, got to do what needed to get it out.
* You should always check with your coffee vendor as spray heads are very common parts and available at your local restaurant supply. There are other brands that use the same parts too like bloomfield. Ask around as this is a fairly cheap part.
Aloha, ukeboy57

You can only use bunn coffee filters or your water and coffee grounds will overflow.

If you will call customer service with the model and date code at 800-352-2866 we will be happy to help you with this issue.

mcdevito75 here, Try to clean your coffee maker by running a decanter full of white vinegar thru the system 2--3 times, then fesh water to rinse out the vinegar. Use a new or clean filter at the beginning of the vinegar treatment and after when you rinse with regular water.

Is the coffee coming out hot enough? If you measure the coffee as it comes into the carafe, it should register at 175-185 degrees. If it doesn't, then it is a problem with the machine and needs to be replaced. If it is that temperature, then the carafe needs to be replaced. Please contact customer service with the model and date code located on the bottom of the machine. If the machine is 3 years or less it can be replaced at no cost. If over 3 years, it can be replaced at a reduced cost.

Hi - Any time I've had an issue with my Bunn BT10-B, I go to the website, www.bunn.com , and go to their Customer Service area. They have been extremely helpful and informative.

Are you rapid firing your coffee maker?Not designed to do that.. If the water heated that fast it would boil dry if you ever left it unattended and on. The reservoir is heated with the time it takes to drink a full pot taken into consideration for reheating.. If you are serving 20 cups with a 10 cup machine, Expect a delay, especially if you are refilling with cold tap water. Sorry.

clean your spray head by removing it and at the same time run the cleaning spring up through where the spray head screws to. before replacing spray head place your pot under and pour a pot of water through,to rinse.when done replace spray head .wait for it to heat up and your set to brew again...