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The Bunn has a little stopper that closes the water drain port in the reservoir while the lid is open. You can see a little white plastic pin protruding up out of the grate with the lid open. When you close the lid, it pushes on that pin which causes the stopper to lift off the drain port, allowing the water in the reservoir to enter the heating tank.
If water is entering the coffee basket BEFORE the lid is closed, then something is wrong with that little stopper. It may have a chunk of debris on it preventing it from sealing, or it may be deteriorated, torn, disconnected, etc.
Only way to know is to remove the the screws in the grate and pull the top off exposing the reservoir, and the stopper assembly. The little plastic flapper disc should be seated in the reservoir drain port. It should be relatively flat (not wrinkled) and covering the drain port completely. Test it by pouring some water into the reservoir. If it drains out without you activating the stopper, then a repair is needed.
Move the lever up and down and check its operation. The arm must move freely and close when released. There should be no dirt or debris on the sealing surface of the flapper nor on the sealing surface of the drain port. Gently clean with vinegar as necessary. If the seal is damaged, then a replacement is required.
I had this problem, reservoir connector was blocked so a small amount of water was entering the tank but the rest was going straight to the overflow and making the float switch. I removed the tank and the condenser then laid the machine on its back (this will cause all the water in the overflow to flood out onto your floor) the point at where the tank connected had 2 screws, I removed them and the connector and the drip tray under it come away. I pushed the inner part on the connector in and this revealed a lump of soggy fluff that was blocking the water from getting to the tank.
For the water to flow to the reservoir and the low water light comes on then I suggest a compression test to check for head gasket/ cracked head. Next have a coolant system pressure test done to check for leaks . It is ok for the radiator cap to allow a small amount of hot water into the reservoir but when it cools down the water should be drawn back into the radiator. The first check is to test the radiator cap for correct operation. Then do the rest.
see this instructions:God bless you
Ensure the Dirt Devil is connected to a working power supply
if it does not turn on or operate. Check the fuse or breaker and
replace or reset as necessary.
Empty the dirty water tank if there is little or no suction.
Turn off the Dirt Devil and grab the top of the dirty water tank. Push
on the latch to release the tank and pull the tank off the base. Remove
the lid and empty the dirty water into a sink. Replace the cap and hook
the front of the tank onto the machine base. Hook the nozzle on the base
so that the nozzle is level with the cleaner base. Push the back of the
dirty water tank down and into position.
Check the dirty water tank and empty as necessary if there
is water leaking from the cleaner. Open the latch on the top of the
solution reservoir and pull the reservoir forward. Fill with Dirt Devil
brand cleaner to the fill mark. Fill the rest of the reservoir with hot
water and close the cap. Replace on the base unit.
Make sure the solution reservoir is seated firmly in the
base unit if there is no cleaning solution dispensing from the unit.
Fill the solution tank with cleaner and water if the level is low.
Examine the hose and nozzles for possible obstructions if
the carpet cleaner does not seem to be operating correctly. Remove any
Since this is the expansion tank for your radiator - test your rad coolant to be sure it is in fact a coolant mixture appropriate for your climate and not just water. If your reservoir is not cracked - pour an equal amount of 100% coolant as there is water in the reservoir. (not the premix stuff) when you run your vehicle the heat from the engine will melt the h2o and mix with the coolant to form a 50% mixturer. Be sure the coolant you add is the same coolant used in the radiator.
My Keurig B60 had the same issue. The water reservoir has a valve in a nipple on the bottom that slides into a clear plastic fitting within the base of the unit. Water from the reservoir is supposed to pass through the fitting and into the pump, which is also in the base. Over time, hard water deposits can build up on the nipple or the mating fitting (or both) such that a good seal is not made when the reservoir is in place and water slowly leaks out the bottom. To fix this, I removed the five screws on the bottom of the Keurig and then removed the two screws which hold the fitting in place. I gently cleaned both the clear plastic fitting and the nipple in the bottom of the reservoir with white vinegar. After rinsing both with clean water and drying both, I applied a small amount of silicon faucet grease (available at any hardware store) to both parts. I haven't had any more leaks since, although I assume I will have to repeat this operation periodically.
More then likely there is nothing wrong with the water seal but simply the tank was not placed properly over the seal and water was bypassed to the reservoir. If a significant amount of water sits in the reservoir the "Water System Fault" trouble will appear and stop operation. The easiest way to remove the water from the reservoir is with an inexpensive ($5) siphon tool available at any auto parts store. Once the water has been removed and you can operate the machine and it goes through the "Warming" sequence you will receive a "Air in water System" alert. Follow the simple directions in the manual to correct this trouble and your system is back to normal. I have heard people have been charged by technicians up to $600 to fix this trouble and told the seal had to be replaced. Just take care when placing a full water tank back into place and enjoy : )
These tanks can't actually be overfilled since all water poured in displaces the exact same amount of water coming out the spout. So, whatever amount of water you pour in, will be the same amount of water that flows to your pot minus the amount absorbed by the coffee grounds and filter.
Your problems sounds like an undersized (Non Bunn) filter, or clogged brew basket. To verify this, try pouring in only half the water for your brew cycle and wait for it to finish dripping, then pour in the rest. If no overflow has occurred, you simply have the wrong type of filter. If overflow begins again, you have a clogged brew basket, since no Bunn can flow too fast for the brew basket to keep up with it.
This is because Bunn filters are manufactured differently than generic store bought paper filters. They will flow faster, brew cleaner and stand up better than normal generic filters. Remember, Bunn makes their OWN filters for good reason. They made the first, best paper filters for drip coffee pots, and all others are just generic dioxin gas producing paper.