Bunn model bxb water heater kicks on and off more than usual

* Bunn model # for specific solutions.
* Most Pro/Office models have a pre-heated tank.
* Most models (Without Vacation or heater switch) will be heated all the time.
* Care must be taken to keep the inner tank filled.
* Pour cold water into fill tray till water comes out of the brew basket.
* Water will stop coming out of brewer once the tank has been topped off.
* If pot is not able to brew after 20 mins of pre-heating. Then call for service.
* Note; most office and Pro machines used in food establishments are from coffee vendors. The larger machines should be serviced by qualified Bunn service techs.
* Contact your coffee vendor or Bunn service ctr for advice.
Aloha, ukeboy57

Depends on age warranty claim or replace is the best way because of marketing technical design of this machines and your own safety or for others depends on where it leaks.
If its an expensive machine there are cuff kits for to get but if you selling a kit it can happen that there are for one model more differences made on marketing technics development and changed parts in between one or 2 years of age difference , so year of build and serial number can be neccesary but it does not have to be, but err on the side of caution.

Call for service! Repairs should be performed by a qualified Bunn tech.
*** the following is for information only ***
* Thermal fuse blows due to no water in tank and/or over heating.
* Depending if the tank was empty and how hot the element got will determine what blows.
* If it was completely dry when plugged in then the element got cherry red hot and may have melted gaskets as well as all the fuses.
* Depending on the model, there may be 2 thermal fuses or even a 3d on the thermal blanket.
* If the brewer was filled but left on for a long period (weeks?) then the tank just boiled off till the fuse blew. Good chance the element is ok. But have to check to be sure.
* No model given so I'm guessing a VPR or similar pour over (BXB series) These blow out when not properly filled before powering up.
* VPR's .usually have a normal load on from the warmer blanket. The load (amps) will kick up on the initial heating of the tank (filled with water) then drop down after reaching temperature.
* There is an additional load if any warmers are turned on.
* The on/off switch on a VPR will activate the main heater element AND the brew warming plate (Blanket stays on all the time)
* Easiest way to check is amperage loads on each section. Continuity is a bit harder as it does not tell you if it's shorted (unless you know the resistance loads to begin with)
* Final: Get a qualified service tech to check just to be safe.
Aloha, ukeboy57

It is called a Thermal Cut-Off .

Is it still under warranty? Bunn should take care of it for you if it is. Usually if the coffee is only warm it may mean that a thermal limit has tripped. The water stays warm because the tank has a heater blanket that is wrapped around it but you aren't getting any power to the heater that is in the tank.
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I recommend slowly pouring in about a half a pot of cold water without coffee in the filter basket 5 or so minutes before you brew in the morning. There are 2 good reasons to do this-
1. Overnight you are having some evaporation due to the fact that your Bunn brewer has a reservoir that keeps a couple of pots worth of water at brewing temperature... a better temp than most "home" model brewers. This will top off the reservoir and you will not "short pot" except for the amount that the grounds themselves hold back.
2. Also overnight, due to the fact that the water is kept hot, the oxygen can dissipate from the water in the tank. Topping off with fresh water will mean a fresher first pot.
The Bunn brewers have a low wattage/keep warm heater so the actual heating element isn't doing all of the work over those long periods... it only kicks on when the temperature in the reservoir drops considerably (like after brewing). Be sure to let the brewer heat back up before brewing (you will hear it stop heating)
Hope this helps.

The brewer has not had enough time to reach its operating temp (usually 7 mins after a brew cycle). If that is not hte case then the machine needs to be descaled.

Possible igniter trouble. Should get an expert and watch him and see what he does. That way the next time you just might be able to repair it.

You can check to see if the switch on the side of the tank is turned on and is working, but if the problem is with the tank heater itself, you can't get replacement parts for this model unless you can find a broken one at a garage sale or a Bunn service center. You can obtain a list of service centers in your area from www.bunn.com

The Bunn coffee machine has an internal tank used for holding approx three potfulls of water at just below brewing temperature. When you add water for a potful, the thermostat senses cold water and starts the brew heater. The water level inside the tank comes up and goes through the sprayhead. This "surge" of water, that you call drips is normal. The hot water stratifies to the top of the tank, just like an electric water tank in a house. The internal pot heater kicks in and boils the water already in the tank, raising the water level in the siphon pipe to the sprayhead until the reservoir under the add water opening is empty.