20 Most Recent Bunn CWTF 42 12-Cup Coffee Maker Questions & Answers


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


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


What about Bunn water level? Too high? Too low? Not filling? Leaking?

Bunn CWTF Coffee... | Answered on Nov 25, 2014


Most likely cause is that the seal between the water reservoir and the tank is leaking. Not uncommon. If you can find a replacement seal go for it, otherwise the old one can be made serviceable by coating both sides with a thin bead or layer of clear silicone. Allow to cure for 24 hours before powering the coffee maker back up.

Bunn CWTF Coffee... | Answered on Nov 23, 2014


If its been changed to 220V plugging it into 120V won't damage anything, it just won't work. Replace the plug with a 120V plug end and plug it in. If it works its120 if it doesn't, its either a 220V setup, or you have a blown fuse in the unit/power supply or some other defect.

Bunn CWTF Coffee... | Answered on Nov 05, 2014


the plunger for ur solenoid valve assembly might be stuck in open position ... ur click sound maybe came from ur funnel lock during brewing. water shots from the fill or oveflow cup due to contoniuos supply of water , try to close ur main water and c if water will also cease

Bunn CWTF Coffee... | Answered on Oct 02, 2014


test element for failure

Bunn Coffee... | Answered on Oct 06, 2019


Couple of ideas.

Your weak coffee could be due to the machine not getting hot enough, which is usually caused by calcium scale buildup on the heating element (the "burner").

Try descaling with a citric-acid based cleaner, such as Dezcal or Durgol.

The second is the coffee your using is a weak blend. Try changing to a different coffee and see if the strength is better.

Bunn Coffee... | Answered on Jul 15, 2019


This sounds like the light flickering rather than a faulty connection. You can check for a bad connection by tuning a nearby radio receiver to no station in the AM band. If there is a bad connection causing this you'll hear the sparking (in time with the flickering) on the radio.
Flickering is a common effect seen with neon indicator lights when they age and does not affect the switch function at all, so can be safely ignored.

Bunn Coffee... | Answered on May 02, 2019


The water inlet valve may be stuck open from mineral deposits. You can get rebuild kits for the older ones or just replace the valve?

Bunn Coffee... | Answered on May 01, 2019


If all passages are not plugged up it should flow through with or without heat in the tank.

Bunn Coffee... | Answered on Apr 27, 2019

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