Hooking up a bosch dishwasher, i get it all... the power hook ups.. water.. and drains... but the vent hose... the diagram in the instructions, shows tucking it into the side panel before install... does this hose vent moist air into my cabinet opening?... and not to mention all the electical connections are down there too.... can you tell me what this vent hose is for..... and what do i do with it??? thanks
That vent hose is called a condensation tube. it runs from the right side of the dishwasher up in a loop then back down into the back base of the machine. it allows the dishwasher to breathe in a sense during a wash since it makes a complete seal. if that tube was obstructed or not directed in the up-loop then back down into the base, then it would be possible for water to pressurize through the seals and leak some water onto the floor. kind of like shaking up a new soda bottle. it helps release pressure from the heat. it wont leak water into the base but the tube will accumulate humidity which is normal and will evaporate quickly.
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Yes it only uses hot water. There should be a 3/8 fitting to hook up a water line. The drain hose connects to the air gap on the sink and when hooking up the power if there is no power cord be sure to hook up the black to black, white to white, and green to the green or bare wire.
I just installed my Bosch dishwasher a few days ago and wondered about the same thing. The instructions for hooking up water supply and drain lines did not mention this third hose at all.
However, 'the third hose' (which appears open on the lower end, but loops up high) is attached at the other end at a point directly on the other side of the dryer wall from an opening inside the dishwasher, described elsewhere as a vent (somewhere in the manual we are advised not to place anything such that the vent could be blocked). I'm assuming that when water is pumped to the drain, since the chamber is otherwise sealed, there has to be an opening for it to breathe in air to replace the evacuated water, and conversely to allow air to leave when new water is taken in; thus both vacuum and pressure build-up are avoided.
So, although this third hose is not involved in installation, a little foresight by the manual writers would have had them mention it and put our minds at ease. Maybe we are not supposed to be curious....
Most likely a clog, either along the drain hose, or more likely, actually in the air gap vent. Disconnect the drain hose from the dishwasher and place a bucket under it. Run the drain cycle. This should clear any clog along the drain line. Remove the air gap vent from the top of the sink and disconnect the other hose. Remove the small cap at the top of the vent by pressing the small clips on opposite sides of each other and lift the cap out. Using either a strong flow of water, or, a thin, long-blade screwdriver, remove any debris from the two hose connectors. (Problem is most likely in the smaller hose connector which is preventing water from flowing over to the other connector to drain out). So, during operation, water goes up the small drain hose, but can't go any further and water remains in the dishwasher.
Clearing the air vent cap/filter should solve your problem.
I ran into the SAME problem with my Bosch SHX46A06UC /21. The problem ultimately ended up being a clog in the air gap vent, (meaning, SOMEBODY ran the dishwasher without the bottom filter being in place or not in place properly). Remove the air gap cover and upper surface nut to drop the air gap vent into the area under the sink. Disconnect the hoses from the air gap vent filter (placing a bucket under the hose from the dishwasher). Run the drain cycle on the dishwasher. The washer should drain into the bucket and let you know that your pump works and that there are no clogs or kinks in the drain hose. (This will also remove the clog if so). The air gap vent's smaller hose connection is MOST LIKELY where your clog is. Look at the upper end of the air gap vent. You'll see a couple of clips on opposite sides of each other, that hold the air vent cap in place. Using a small screwdriver, (or your hands if you can), depress the clips (or one at a time) to get to the point where you can pull the vent cap off the filter. Either use water or a thin, long blade screwdriver to force any objects out of the filter. You should now have full flow through both branches of the filter. Using water and a rag, clean the vent cap and filter. Mount the air gap vent filter back onto the sink. Reconnect the hoses and remove the dishwasher's internal filter(s) and clean them as well while you're at it, making sure to remove any debris that might remain underneath the filter and has the chance of clogging the unit again.
Your dishwasher has a water line in and a waste water tube on the back of it. You need a source water line where the DW is at and you simply connect it. The drain hose needs to hook up to a waste water trap on a sink or somewhere. Power it up and that should be all there is to it. I suggest that you hook it up with a couple of extra feet of hose though incase you need to pull it out for service or something. FYI..
there is always a little water in all dishwashers. Sounds like to me that you may have a kinked drain hose or maybe the way you have hooked the drain up. The drain hose should go to a vacuum break that is mounted on the sink flange and then another hose goes to the disposal. If you have the hose hooked directly to the disposal you may be getting water back from the sink to the dw. raise the hose up as high as possible and attach under the sink so there is a high loop in your hose so water cannot drain back from the sink
Disconnect the power to the unit. Remove the lower access panels and check the tray under the dishwasher. You will probably find it is full of water. Use a towel or a sponge to remove the water. There is a float that will stop the operation of the unit and run the pump if water is in this tray. Test the unit. If there are no leaks, check the drain hose under the sink. THE DRAIN HOSE MUST RUN UP TO ABOVE THE TOP OF THE MACHINE THEN TO THE DRAIN. If the hose is not set up like this, water from the sink drain will flow into the dishwasher and overflow into the tray under it.
If there is no water in the pan under the dishwasher there may be a problem with the pressure switch at the side of the pump housing but the only way to know for sure is to do some electrical testing with a volt/ohm meter and the wiring diagram located within the appliance.