Bunn CWTF - Recent Questions, Troubleshooting & Support

You should call your vendor for service. Especially if this equip is on loan from them. *** the following is for information only. All service should be done by a qualified tech.*** * CWTF have an on/off heater switch in the back of the brewer plate. Make sure this is on as it provides power to both heater and heater blanket. * There is a schematic on the back, side, or top panel. You will need a continuity meter to check the following: * There is a thermo fuse in series with the heater element. check and replace if open. * There may be a 2nd High limit fuse (disk shape) or another thermo fuse on the top of the tank. usually zip tied to the water faucet lines. check and replace if open. * There is a thermostat (adjustable) in series with the element that may be open, shorted, or out of adjustment/calibration. Replace as needed. * The element could be open or shorted to ground (ripped casing exposed electrical wires to water and grounding to tank housing). Replace element (and gaskets while your at it) * I suggest getting a repair kit with all the gaskets as they are probably burnt or cracked from age. Aloha, ukeboy57

Bunn CWTF 15-APS... • Answered on Feb 08, 2018

The coffee dispensing valve is stuck open. It may be due to Calcium deposits. Descale the machine or manually clean the dispensing valve and the diffuser disc that unscrews to be removed. This diffuser is visible just above the coffee pot. Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/edward_bbd2c7ff4ee1828a

Bunn CWTF15 • Answered on Jan 31, 2018

Leaking from top of tank; Call for service as this is an electrical hazard. *** the following is for information only. *** * Replace any worn gaskets and silicone tubes. * There may be cracks in the metal pipes. Hard to see, but there, if you remove the lime deposits. * check the top tray nut if the gasket to the tank is missing. It's about an 1-1/4" round washer with about a 3/4" hole. Usually made of white silicone rubber. It seals the fill tray to the tank. Leaks often. * Bunn equipment can last quite a few years (decades?) but the gaskets do get hard and the tank needs to be water tight to work properly. Since this is already an old brewer and you've saved money rebuilding it. Suggest going further by replacing all gaskets. Yes they do need to be snug with no cracks. Aloha, ukeboy57

Bunn CWTF Coffee... • Answered on Jan 20, 2018

The water tube is the tray filler (for brewing). This is the output from the water fill valve which is usually set at a timed interval just enough to fill the tray with water to make a desired brew. There are other units that will automatically sense the proper water amount and fill as needed. * All of these are on demand systems and should not be filling excess water when not in use. Call your vendor for service. * Excess water is usually caused by a leaking water fill valve which will need to be replaced. Tip: click the brew switch on and turn off the brewer to stop. Do this several times. You should hear a 'click' then a whine as water fills the brewing tray. Place an empty pot or metal decanter to catch the hot water from empty funnel (no coffee needed) The brew will be higher and will overfill the decanter so keep an eye on it and dump water as needed. What you are doing is possibly dislodging a bit of sand that may have got stuck in the valve thus causing a small leak. Snapping the valve several times may clear it. If not then call for service. * Some time the timer can get scrambled as the newer units are all digital and get out of calibration or blown out. Especially after a blackout or Electrical storm. Call your vendor for service. * Auto level probes can get dirty and will need service to clean as it's usually located inside the machine and tank.. Call a tech to be safe. * Sometimes constant running of Hot water is a sign of a bad heater and/or thermostat. Thermostat may be shorted and boil all water off. Heater could have ruptured and short to ground which boils off water. Both cases will cause the brewer to boil vigorously (Gallop!) then run completely dry. Over heat and trip out breakers and or thermal fuses. Hopefully it shuts down before catching fire. (There are safe guards in place as Bunn equipment are well designed.) * Finally: Leaks in any form, especially from the body of the brewer will cause an electrical hazard. Call your vendor for service and replacement. Aloha! ukeboy57

Bunn CWTF 15-TS... • Answered on Jan 18, 2018

by 'reset' do you mean that you moved it, tilted it, shut it off and back on?

Bunn CWTF 15-APS... • Answered on Jan 11, 2016

If you have a hot water tap on the brewer, then most likely the thermal fuse is blown. You can get one from www.bunn.com. It's above and almost behind the tank, and most likely brown by now

Bunn CWTF15-TC • Answered on Oct 30, 2015

Remove the front panel and use the instructions there to set volume, if that does not work then the level board is damaged.

Bunn CWTF 15-3... • Answered on Sep 01, 2015

Inlet valve is leaking.Valve is located by removing front access panel.Can be rebuilt using p.n. 1111.0002 repair kit.You can verify by removing top lid and finding water leaking at fill basin tube.

Bunn CWTF 15-APS... • Answered on Sep 01, 2015

delime the sprayhead and reservoir drain (in the top) with a deliming spring or a screwdriver. to delime the tank, put a half gallon of vinegar in the top and catch the hot water as it comes out of the sprayhead. leave it sit for about 20 minutes and brew at least 8 times (w/o coffee) or until you can no longer taste vinegar

Bunn CWTF Coffee... • Answered on Jan 28, 2015

jumper the red and white wires at the terminal block

Bunn CWTF 35-APS... • Answered on Jan 28, 2015

delime and recallibrate machine. see tips for bunn cwtf

Bunn CWTF20-3... • Answered on Jan 28, 2015

see deliming tip for bunn cwtf

Bunn CWTF 15-TS... • Answered on Jan 28, 2015

turn the water main off, unscrew the spigot base just below the handle, and pull out the silicon cup. delime spigot and inlet with a deliming spring or a screwdriver. make sure the cup is pushed all the way onto the handle post and reassemble.

Bunn CWTF 15-2... • Answered on Jan 28, 2015

delime the sprayhead and the reservoir drain in the top with a deliming spring or a screwdriver

Bunn CWTF 15-3... • Answered on Jan 28, 2015

lime builds up on the metal surfaces where the hot water cools down or evaporates, such as the sprayhead, the waterline to the sprayhead, the reservoir inlet, or the insides of the tank. the sprayhead and reservoir inlet buildup will restrict flow and extend brew time and may even not brew through all of the grounds. to fix: 1. remove the top of the brewer. the reservoir is right on top and the drain looks like a nut with a hole in it. lime will plug this up. using a deliming spring or even a philipshead screwdriver, push through and twist to get rid of the lime. 2. unscrew and remove the sprayhead and bore the lime out of the holes with a small flathead screwdriver or a paperclip. 3. if necessary, unscrew the reservoir drain nut, place it and the sprayhead in a cup of straight vinegar. for more stubborn lime, use CLR, but wash and rinse thoroughly. 4. if you have a deliming spring, push it through the outlet waterline to the sprayhead all the way past the 2 elbows and pull in and out, removing any lime buildup. 5. rinse parts, reassemble the reservoir, and brew a little without the sprayhead first to get rid of any loose lime. then put sprayhead on and run a test brew. if it brews short or too much, see tip for recallibrating

on Jan 15, 2015 • Bunn CWTF 15-3 Coffee Maker


1. you need a 64 ounce graduated measuring cup or bucket 2. make sure the brewer is heated up to temp and the green light on the front is lit 3. open the front panel of the brewer 4. put the microswitch on the circuit board to "unlock" position 5. make sure the sprayhead is cleaned and open, the brew basket is on, and the measuring cup is in place to catch the water 6. press and hold the brew switch until the inlet solenoid clicks 3 times, then release 7. once the water level is at about 40 ounces, turn the main red switch off and let the rest of the water come out 8. if it brews short, press and hold the brew switch again until the 3 clicks, then press and release the brew switch for 2 more second of brew time (up to 5 times per brew) 9. if it brews too much, press and release the brew switch for two less seconds of brew time (up to 5 times), then press and hold the brew switch until the 3 clicks then release 10. once you get to 64 ounces, put the switch on the circuit board to lock and replace the panel 11. enjoy!

on Jan 15, 2015 • Bunn CWTF 15-APS Coffee Maker


you'll have to recallibrate. use a 64 ounce measuring cup and follow the instructions on the inside of the front panel.

Bunn CWTF15-TC • Answered on Jan 15, 2015

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