Question about Bunn -O-Matic Corp. 2 Warmer Auto Brewer Black

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Coffee Brewer comes out warm not hot

I have a older Bunn Commerical Coffee brewer with one burner on top and the other where the brewing unit is. When I make the coffee it comes out warm and not hot. Is there something I can replace in this unit or is there a temp regularator.

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I have the same problem. After checking the thermostats, as described in the service manual, the only other problem I can think of is that the capillary bulb is too close to the heater element. I adjusted it so that it is hopefully hanging straight down as prescribed.

Posted on Sep 25, 2008

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Look at the top of the coffee maker you'll see two screws and the warmer tray and the cover for adding water. remove the two screws and lift the top off. the warmer has two push on spade terminals. pull the wires off them. below is a tray where the water goes and you'll see a brass bushing. this is screwed into a fitting on the water tank. use a piece of steel as a spanner and unscrew this fitting. don't lose the gasket that's under it. the main wires for the burner element and thermostat are also under this tray. look at the top. there's nine screws that hold the top on the water tank. two white wires go to the tank warmer and two wires go to the tank heater inside. you can try turning up the thermostat setting to a higher range and see what happens. there's a copper pipe that comes from the tank to the sprayhead the tank holds approx three urn fulls of water. if you have an analog meter you can check the element for continuity on the RX1 range. Do the same with the tank warmer element. Bunn-o-matic has a web site you can buy replacement parts or nelson appliance can get you parts too.

Posted on Nov 19, 2007


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Posted on Jan 02, 2017

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* You may sometimes hear a slight boiling sound from time to time (about 15-30 mins apart). Notify your vendor as the warmer blanket may be out. (your brewer will still work but call them anyway.)
* Check your manual for setting up procedures and checks. It's available on line:
* Constant boiling (more than 15 mins) with lots of steaming is a sign of an electrical problem. Unplug machine and call vendor for service.
* Final; Unplug unit and check for 'stuff' in pour over tray. I've found Chocolate, Cream, Milk, powder, sugar, honey, and a dead rat in the tray. Crew will repour old coffee or beverages into brewer to 're-heat' them. Notify vendor for cleaning or replacement (it happens all the time.)
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if you listen to their video (link below) they mention it has a pre-heated tank of water already in the brewer. This means the brewer needs to be pre-filled with a full pot of water and pre-heated prior to using the brewer. Unplugging this unit won't be a problem UNLESS it was emptied of tank water and not refilled when powered up.
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* There is an on/off heater switch located in the back of the brewer. This should be on when the brewer is needed. There will be a 20 minute wait for the "ready" to brew light comes on. If you brew before the light comes on then the coffee will be only warm.
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P.S. The 3 liter brewer has a much larger tank than the regular 2.5 brewer. So expect it to take a bit longer to reheat a full brew. Some customers will request the 'Airpot' or 'Pump pot' to be filled to the top which means even more water is needed to be heated. Expect at least a 20-30 minute wait on reheating. I've found that customers that use this large a pump pot will brew +3 pots in a row. (Regular, Decafe, and a 2nd regular or 'flavored' coffee.) Often brewing without waiting for the ready light. If this is the case then mention this to your vendor. You may need a 2nd brewer, larger brewer, or have the brewer hooked up to the 'Hot' water line to get pre-heated water to the brewer (though they may need to modify the water valve to one that is rated for hot water inlet line.). If your using larger 3L decanters then having pre-heated decanters and using the 'pour over' function can aid with faster brews. Though this method is a lot of work for the operator.

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You should call your vendor for service. Especially if it's on loan from them.
*** The following is for information only. Equipment should be serviced by a qualified tech. ***
VPS are pour over brewers. Like the 12 cup brewers you find at home, they need to be filled with 12 cups of water (a full pot), heated and then peculated over the coffee grounds and collected in a decanter.
BUT there is one main difference! The VPR and similar COMMERCIAL coffee machines are quick brewers. They usually have a pre-heated pot of water stored inside the machine.
* VPR's and similar machines REQUIRE a pre-fill and heating period prior to brewing. This means it's sitting on a level table and filled with water until water sprays from the brew head. At this point the unit is plugged in and the heater powers up. Brewer will pre-heat the water (there may be some water discharge from brew head as the water expands). Ready light will come on in about 15 mins.
* To Brew; Place coffee grounds in filter, place in funnel and brew head, clean empty decanter under funnel, slowly pour one full decanter of water (cold or hot) into brew tray. Do not overflow tray. Allow water level to sink before adding more water. Only fill with one pot as an equal amount will come out the brew head and funnel.
* FYI Coffee grounds are usually in pre-messured packets for office use. A simple guide is one tablespoon per cup. (level or heaping spoon is up to you)
* Since your brewer was bubbling at one point. I'm guessing it had water in the pre-heater at one time. But if it's not in use and left plugged in all that time then the water has probably boiled off. Hopefully someone unplugged the brewer prior to the unit blowing the thermal fuse.
* You can test the VPR by following the Pre-fill instructions I've listed earlier. If the brewer heats up and does not continuously boil (shorted condition) then try a brew. If it works then your okay. Otherwise the unit will need service for a blown high limit or bad heater element.
* Call your coffee vendor anyway. Many coffee vendors will service your brewer of even replace it as long as you buy coffee from them. Ask around.
* check for free download of VPR manual

Aloha, ukeboy57

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1) The on/off switch for the lower warmer could be burnt out.This switch also operates the heating element.
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