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Bosch Dishwasher Troubleshooting
Your Bosch dishwasher can run a test cycle which will quickly go through each stage of a wash programme in order to find out at what point a fault is occurring. It will only give you a general idea of where the problem lies but is a useful first step in diagnosing the issue.
The steps to start the test cycle vary depending on what model you have but the basic method is similar across the range. It might be that your dishwasher doesn't have the same button labelling as described in the steps below. In that case try holding down the buttons which have similar names. After a little trial and error you'll find the right combination.
Make sure the dishwasher is switched off.
Press and hold the Power Scrub Plus and Regular Wash buttons.
Turn on the dishwasher, then release the two buttons.
The light above each of these buttons should flash.
Start the test cycle by pressing the Power Scrub Plus and Regular Wash buttons again.
The test programme will begin and an error code will be displayed at the end of the cycle if a fault has been detected.
You can find a list of Bosch dishwasher error codes and their definitions here.
Here is an excerpt from "Bosch Dishwasher Troublesoooting".
Running a Test Cycle
Bosch dishwashers have a test cycle which can be run as a troubleshooting
measure. The method to run this test cycle is similar across the Bosch
dishwasher range so if your dishwasher features seems different from those
described below then try experimenting, as the process is fairly straight
forward and will be very similar. Bosch dishwasher model numbers are usually
found around the top or lip of the door. One of the most common differences
between dishwasher models is simply the names of the buttons. For example in
the first example below, POWER SCRUB PLUS and REGULAR WASH may be called WASH
and ECO depending on your dishwasher model and the country you are in. The
other key difference is whether your dishwasher has a display panel (which can
display error codes) or not (in which case a program light will illuminate to
tell you the fault.
To run the test cycle hold down the POWER SCRUB PLUS and REGULAR WASH
buttons. Whilst held down press the ON/OFF button. The lights above them should
flash. Now you can check the status of each dishwasher program by pressing its
button. Now you can run the full test cycle = Press the POWER SCRUB PLUS and
REGULAR WASH buttons again. The dishwasher will start up and when the cycle has
ended one, if you have no display panel on your dishwasher model the indicator
lights will illuminate if a malfunction was detected as follows -
CLEAN - A temperature sensor fault. If this is the case then the test cycle
will be very short as the dishwasher will terminate the test once it's been
RINSE/DRY - A water sensor/filling fault. If this is the problem then the
test cycle will not complete as the dishwasher cannot detect the right level of
water, the dishwasher will just keep filling and draining again.
WASH - A heating fault. Check your heating element.
If you do have a display panel on your Bosch dishwasher then after the cycle
is complete an error code will be shown if a fault has been detected. The error
codes are as follows -
0 - No errors have been detected.
1 - A water sensor/filling fault.
2 - A heating fault.
4 - A water filling fault. This can also appear as F on the display during a
8 - A temperature sensor fault.
When troubleshooting your Bosch dishwasher, running
the above test cycle is a good start in diagnosing the problem and should give
you an idea of where the problem lies with your Bosch dishwasher and what fixes
and repair are in order. Our general troubleshooting page will give you some
ideas on other things to check on your dishwasher. Good luck!
My Bosch DW SHU5302 also got stuck during a cycle and ran and ran. Turns out this is a known problem with these DW's. The problem is that a trace on the main board burns off that controls the heater. If the heater doesn't come on then the DW keeps running waiting for the water to heat up. Re-soldering this trace fixes this problem. If you get a repair guy out, he will only change the board. They are not allowed to re-solder which doesn't fix the problem for long as the same trace will burn off. Did this about 8 years ago and it is still fine.
-Try to use a name brand powder, rather then a generic. Even a small box. I had similar problems with my LG dishwasher when I tried to save money by buying a generic powder. My dishes did not get clean and white marks were left behind on my stainless steel DW liner and the dishes. When you ad the powder, do not over fill the dispenser. Add less than the full dispenser cup and close it. Place some powder in that shallow square indent on the dispenser lid to help the pre-wash cycle. Also, run the water in the sink until hot water runs immediately before you start the DW.
-If, after using Electrosol or Cascade for 2 - 3 loads and your dishes do not come out clean, then I would run a load of dishes without adding the soap. Start the dishwasher and wait for it to fill and begin to wash. Open the door and add one cup of vinegar (white vinegar is fine.) Feel free to ad another cup after the first wash water drains and the second wash water enters and the DW begins the wash cycle again. Run a load of dirty dishes with the soap and check for good cleaning.
-If the problems continue, it is time to remove the filter assembly by removing the 9 silver phillips screws from the filter assembly. You will also need to remove the lower sprayer arm by pulling straight up and then out. With a flashlight, inspect the sump area that was hidden by the filter assembly, looking for any debris that has jammed into anywhere down there. Watch out for broken glass as you feel around. Reassemble and test with a load of dirty dishes.
The poor drying may be caused by not keeping the rinse aid re-filled. Check that first.
Also, these water and energy conserving dishwashers actually use the "dirt" from the dirty dishes to help clean the dishes during the first two wash cycles. Simply clear the big chunks off the dishes and put the dishes in the DW.
Please report back what you find or if you have more questions. OK?
The most common reason for an E1 error on an LD dishwasher (that does not have a leak, including directly under the dishwasher) is the drain hose between the dishwasher and the drain does not have a rise in it between the DW and the drain. Either install a proper AirGar valve or attach the hose to the bottom of the counter top so that it raises 30" between the DW and the drain. When that raise does not exist, the laws of physics tell you that you WILL have a siphoning effect from the DW into the drain, causing the LG to report error code "E1", which is true because of the water leaving the DW during all the wash and drain cycles.
The E1 error is telling you that there is a leak in the dishwasher. After confirming that there is no leak, even directly under the dishwasher (remove the kickplate and use a flashlight.)
After ruling that out, your problem is almost certainly caused by the drain hose between your dishwasher and your drain. There MUST be a 30" rise in the drain hose between the DW and the drain. If the hose just lays there, causing a siphoning effect (law of physics) that WILL drain water out of the dishwasher into the drain as soon as a wash or rinse cycle begins (after 1 - 2 minutes after they begin. Then the E1 error will be displayed.
The BEST way to fix this problem is to install an AirGap valve (almost free @ any hardware store) in your counter/sink and then running the short pipe to your disposal or sing drain inlet. If that is not possible or for a quick and dirty repair until you can install the AirGap, tie the drain hose to the bottom of the counter top so the rise is created.
Please check at both ends of the drain hose and confirm that you do nit have a leak. Also, please confirm that water is not leaking directly under the dishwasher.
If you are certain that you do not have a real leak, check the impeller (under the mesh filter in the sump area beneath the lower dish rack) is not damaged and is firmly in place.
The E1 error code is a Leakage Error, detected by the motor spinning faster than it should if the unit is filled with water.
Please report back with what you find. Good Luck!
Well done by resolving this problem. The other way to avoid the siphoning problem through the drain hose is adding an air gap valve/connector (available at any hardware store). You can use it even if you don't have a garbage disposal in your kitchen sink. That will assure that you have the proper height of the drain hose.
Hope this helps!