Overflow problem when I hooked my u3 coffee machine it overflows through the overflow tube and then through the back side and continues until I turn off the water supply.

If it overflows it is clogged some where in the tubing. Snake out any and all conduits in unit.

Yes - I agree with the above - the water tank has two magnets a low level and high level - both should move freely in the tank and float with the water level - they determine when the water solenoid is turned off and on - if stuck - it will cause the tank to overflow. If both magnets are there and they move freely - then the reed switch in the case in more than likely faulty.

see deliming tip for bunn cwtf

Hi,
Remove the bottom of the coffee maker, identify two rubber tubes and check to see if one has come loose or is simply not on tight. A simple reattaching of one of the tubes will work.
Another reason could be draining hole getting clogged with coffee grounds. When this happens it is easily fixed by removing the brew group and overflow tray; find the small drain at the back that drains excess water into the overflow tray and opens it up with a pipe cleaner or tooth pick. Flush out any coffee ground behind that hole.

Hope this helps.

Shane

pinched flow tube ? it boils through the tube then shuts off @ boiling no pump yet >

What is happening is that the fill sensor is apparently not working. The washer will continue filling until it overflows the washer!
Replace the pressure switch. This will solve your problem and cost is about $35.00

Before replacing the switch check the hose which comes to the switch also

It is possible that hose has a hole in it or has come undone. If there is no pressure in the hose, then it wont actuate the switch, and thus fill forever.

If your air tube is in good shape, it could be the switch itself, it may be adjustable.

The overflow tube coming out behind the swingarm? If that is where it is coming from sounds like your float in one of the carbs could be stuck.

I had same problem today. It was just a tube disconnected from the water level sensor. Raise the top of the washer and look on the left side of the tub. There should be a plastic tube running from the water level sensor to the control panel. Make sure it is connected. If not simple reconnect the tube and you should be good to go.

The grind on your coffee is too fine, and if not there is too much coffee in the basket, hence the overflow.

i think the water level sensor tube got filled when you had it on it's side, then after the first spin and drain cycle, the tube was again cleared out and ready for real action.