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

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Water won't turn off.

The firehouse that I work in has a bunn 29365, when the switch is activated to make coffee it does not stop flowing when full.

Posted by crabbing on

  • jglover39 Dec 16, 2008

    We have the same problem. Water keeps flowing even after pot full.

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Gord Thurston

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  • 131 Answers

This can be caused by a faulty start switch, a bad flow control board or a solonoid valve sticking. they all work together, so any one can do it. You can test the start switch by hooking a VOM across the contacts, press the button momentarily. power should only go through the switch when pressed. You cantest the solonoid valve by removing the wires off of it and check for continuity across the two poles with a VOM.

Posted on Feb 13, 2009

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You should call your vendor for service on any commercial brewer. (Especially if it's on loan from them)
*** the following is for information only as all repairs should be performed by a qualified tech.***

The CWTF has a start switch activates the timer (analog or digital) board which turns on the water feed to the brew tank. This forces previously heated water out and sprayed over the ground coffee in the brew funnel. Coffee then drips into the decanter.
* It's not often this momentary brew switch goes bad even though it's pressed many times a day.
* Check the on/off switch. Most models will light up when switched on.
* Check the timer. Digital timers tend to be sensitive to electrical storms. Analog timers have a dial and are more tolerant of electrical surges.
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* No water flow then check the water supply line if it's on.
* Final; this brewer needs service. Call your coffee vendor for advice.
Aloha, ukboy57

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CWTF15 WILL NOT STOP WATER FLOW WHEN POT IS MADE.


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

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Parts needed:
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