We inherited a Bunn coffee maker like the VPR model. The machine makes good coffee, but the warming plate actually boils the coffee after it is brewed. We switched the upper and lower warming plates with the same results.
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Re: Bunn UPR warmer too hot
Try connecting two elements in series. See if this keeps it hot enough. (One switch controlling both burners.) See if another brand of burner will fit in the hole. Check to see if the wattage is lower.
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The VPR manual is on the bunn.com website. (Free)
*** the following is for information only as all repairs should be performed by a qualified Bunn tech. ***
* The VPR has two heaters in the brewer. There is an element inside the water tank (cylinder) which is wrapped in a warmer blanket which is also heated. (Like and electric blanket)
* There will be one or more warmer "Hot Plates".
* Most VPRs will power up as soon as it's plugged in. In other words there is no On/Off switch (though this may have changed in newer models or called a 'Vacation' switch that turns off all the internal heaters.)
* Each additional warmer plate will have it's own on/off switch.
* Internal heater(s) have thermal fuses on each heater. There may be a 2nd thermal fuse or High Limit on the tank - it looks like a disk with two tabs. The thermal fuses look like diodes that sometimes are enclosed in a plastic tube. There should be continuity on all good fuses. If it's open then replace.
* The element is straight forward. Similar to what you would find in a water heater. Which is basically what this brewer is. Just on a smaller scale.
* There is a bulb style thermostat wired in series with the main heater element. This is should be set to boil the water but it should not boil constantly. If it's always boiling then it's shorted. If it does not switch on when the dial is turned clockwise. Then it's open. Need to replace.
* Okay final note; I'm guessing the real question here is what the wires look like in the real brewer and not a bunch of lines on a paper. Most Bunn brewers come with a schematic (electrical) diagram under the top lid or inside a panel. So I've had that problem myself even though I have an Electronics background. You just have to take your time and follow each wire to the component. It's all there. But again, this should be performed by a Qualified Tech.
You will need to check the heating element wiring to see that isn't a short on the neutral side. This could cause them to continue to heat even if the thermostat is working. If all wiring is ok check the function and resistance given by the thermostat.
The switches are for the "warmers" only. The brewer has a reservoir the keeps water hot and ready for brewing. When it is not re-heating water (after brewing) it has a "keep warm" heater that is low voltage and keeps it ready to go.
Which grommet, there are several on the bunn models, but the most commonly replaced one is the one for the P. stat. Remove the top panel there are 2 screws one in front and one in back, then lift the top 2 burners off machine that will give you access to the tank.
Your coil may be shorting out on your warmer. Try using the upper warmer and see if the same thing happens. If not, a cheap solution is to swap burners and order a new one . If both overheat, you have too much voltage going to your bunn.
Our Bunn VPR was delivering luke warm coffee. The problem was lime scale buildup on the heating element. I recommend using a cleaner such as Brew Rite or a vinegar solution. If it still does not heat properly, unplug and remove the heating element for cleaning. This corrected our problem.
Make sure you are using the type of commercial coffee pot like the one in the picture. They don't have to have to be plastic with the metal bottom, they can be all glass. The commercial pots are heavy duty and usually disperse the heat well.
If you are using commercial pots the only solution without replacing the warmers is to put three pennies on the warmer and to put the pot on top of them. The pennies will get hot so don't forget and grab them but the pennies help to move the pot just a little way away from the direct heat.