Repairing E.04 Error on Bosch Washer





Introduction: Repairing E.04 Error on Bosch Washer

It was a peaceful Sunday afternoon. A load of wash was in the washing machine. An unfamiliar series of beeps from the washing machine interrupted my football couch potato session. It was flashing an E.04 error. I restarted the cycle but the error reappeared.

Time to read the manual. The manual said that either too much suds or the drain pump was having a problem. I went to the Internet to try to find more information. Jackpot! I found a post of the description and the fix for the error code.

It was obvious that excessive suds was not my problem.

You will need a towel, a flashlight and a 4d nail / brad (or some other metallic pointed thing). You may or may not need some silicone grease to lube the sump cap. (I did not need any.)

If you have water in the drum of the machine, you will need a wet/dry vacuum cleaner with crevice end and more towels and maybe ear plugs if your vacuum is as loud as mine.

Note: Wet/dry vacuum cleaners use 2 inch and/or 1 and 1/2 inch hoses. The smaller hoses and accessories are easier to maneuver inside the washer.

Step 1: Gaining Access

To be extra safe, turn off the washing machine and unplug it.

The access for the drain pump is behind the circular access panel on the bottom right front of the machine. This panel twists off. There are three ears on the panel that fit into three cutouts on the machine front. After the ears are in the cutout, the panel is twisted counterclockwise to lock ears behind metal.

If the panel were a clock face, there is a small hole in it at about the 5. Insert a nail in the hole to gain some leverage. Gently press on the panel with your other hand while you rotate the panel clockwise to move the hole to the 6 o'clock position.

Update - 10/2011: Be careful when you get the cover off. The edges of the hole may be unfinished and sharp. You can tape over the edge while you are working or wear gloves. The more adventurous can grind or file the rough edges.

Step 2: Removing the Sump Cover

The black cover covers the sump for the drain pump, It is plastic and screws into a plastic sump. There is a gasket under the plastic threads to prevent leakage. I did not have any thread/gasket lube on my cover. Your cover may be different.

Be careful when you reach into the sump area because the edges of the hole may be unfinished and sharp.  You can take a file/grinder to the edge, or duct tape the edge, or wear gloves.

Stuff as much of a towel as you can under the cover and under the machine to catch some of the water. The error occurred mid wash for me so there were gallons of water in the drum. One towel was not going to be enough.

The cover is screwed in only hand tight. It might have been the hand of gorilla but you should not need tools. Righty-tighty lefty loosey.

If there is water in the drum, DO NOT REMOVE THE COVER . Only break the seal by turning one quarter turn.

I do not know if the sump is ever empty. I suspect it is empty at the end of the cycle but you would not get the e.04 error at the end of the cycle.

Update 6/2012 -  I opened the sump in response to an o-ring question posted here and found that the sump is not empty at the end of the cycle.  It contains about 1 quart/litre of water. So you need very very thirsty towels or the vac. 

Step 3: Sucking Out the Water

Assemble the hose and crevice tool onto your wet/dry vacuum. Turn on the vac. There is a protrusion - a lip - at the bottom of the sump face. Water will puddle there as you loosen the cover. Place the crevice tool at the lip on the sump. Slowly loosen the cover until water comes out as fast as the vac can suck it up. Turn off the vac when water flow has stopped. My washer had about 5 gallons (20 litres) in it. (NOTE: That's about 40 pounds (80 kilograms) of weight. You may need to get help to lift the vac when emptying it. If no one is around to help, just don't empty the washer all at once.)

Step 4: Remove the Sump Cover

Now you can completely unscrew the cover.  You may have to jiggle it a bit to remove it.  The white thing is the impeller housing attached to the cover that deflects the "occasional junk" that is in the wash water while it directs the wash water to the pump's impeller. 

You can see a "black-white-black" sandwich at the end.  It is the gasket - impeller base- cover.  See the other pictures to see how the gasket fits in the sump cover.  Carefully pull the gasket out of its groove to clean it and the groove.

Step 5: Removing the Junk

This is the view into the sump.  The white circular thing at the top is the impeller to the pump.  The stuff at the bottom is rusted nails, a pin, the back of an earring and a screw.  The stuff of pockets.  I sopped up the water and cleaned out the sump. Spin the impeller with your fingers to make sure it moves freely.  Mine did not!   Further investigation showed a nail was caught in the impeller.  That was the real problem!

Step 6: Final Clean Up and Reassembly.

The impeller housing was kind of grundgey so I cleaned it. I found I had to stick a towel into the sump while I cleaned because water was still puddling at the bottom.

Most of the dirt came off with direct scrub with an old toothbrush. But there was some resistant scale that responded to the pointed end of a nail.

Update 8/2016 White vinegar is often used on stubborn deposits, Sometimes a spray works, sometimes you need a soaking. There are specific mineral-deposit-cleaning products if your water is particularly mineral laden.

The impeller housing is marked to indicate which way goes down. Align the housing and screw the cover back in. I did not see any kind of thread lube / sealant, so I did not apply any. Usually sealants are not used on plastic. However, sometimes there is silicone grease on o-rings. If your model had grease, reapply a little bit if you wiped it off during cleaning or during removal.

Insert the cover and screw it down hand tight. Run the short cycle to check for leaks.

Reattach the access panel.

Smile because you just saved at least $50 on a service call. Now pay it forward and bless someone.

2 People Made This Project!


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212 Discussions

I have the same machine but it is not the model 03 as labeled but a 15. When I take the sump cover off I have no basket. I am looking at a white piece that has a raised circle in the middle and it has notches going around the circle (like a pry bar to fit in). Do you have any suggestions for me on how to get it out so I can clean it out.

15 replies

This is an old topic, but for anyone having the issue with seeing the white plate, I can help. When you unscrewed the black cover with handle and tried to pull out the assembly, it was not unlocked. The black cover attaches to the white plate. So to fix, press back on black cover and jiggle out the entire assembly without pulling off the black cover. There is a small slot it all has to slide through and may be a little stuck from never have being removed before.

I inherited this machine (with the raised white circle) when I bought a new house. I'm guessing no one has attempted to clean out the sump and the appliance is probably 6 years old now. So I got error 4 and tried to follow the instructions here. However I got "stuck" at the raised circle stage. What worked for me was to use the notches in the circle to turn the white plastic using a wide piec of metal that slotted into the notchs. It doesn't matter which direction. I probably turned it a millimeter and then I heard a load pop. Note it took a lot of force to budge that white circle. Once it popped I pulled it straight out without turning. In my situation, the amount of congealed gunk had locked the white piece in place. Also, I had 25 nails and a pin and an earring in the sump. So my advice is try turning the white piece a smidge to break through the congealed mass on the other side. As I write this, I'm thinking you might also try tapping it with a hammer to try and loosen the sludge with a hammer? Good luck!

Very nice to have inherited this machine. Good luck with it.

It is suppose to be attached to the black cover. Put the black cover back on and tighten. Slowly turn to the left putting pressure on it. If that doesn't work use pliers to pull it straight out towards you. Do not twist or you will break off the little plastic circle pieces.

Here's what it looks like


I used a vise grip and long nose pliers to pull it straight out (without turning), clamping on the middle ring portion at different points. Perhaps mine wasn't very difficult to pullout because there was already a break in the seal since water started to flow out when I unscrewed the cover. Normally the white plastic thing is attached to the cover but is allowed not to turn while the cover is unscrewed. The connection between the two is weak in my opinion.

I have the same problem. I tried pulling straight out with pliers but it will not budge. Any suggestions.

I tried that and it didn't work. any other suggestions

Thanks for the information!

I'm having the same problem! Did you ever get it figured out? I've pried and pulled. Got bloody knuckes.

Sorry, I do not have an answer for you. Apparently, no one who follows this 'ible has an answer for you either. Have you tried contacting Bosch customer service? If you find a solution, please, please post it here. As you see, other people are looking for the answer.


Hey, can you post a picture? I have not seen your model. Maybe I or one of the followers can figure it out.

I can't get my white cover off either! It didn't come off with the black cap and won't turn, pull out, or pry out. The black cap doesn't even seem to be connecting with it when I screwed it back on and pressed while turning. I'm so excited to see what's caught up in there!

I have the same problem as LisaB43. I tried pulling with pliers and the white cover with the circle on it will not budge, Any suggestions on what to do next

Is the white impeller supposed to come out ? I can’t seem to budget from its spot.

1 more answer

No, the impeller is not suppose to come out. It should be securely fastened to its shaft.

Just a correction on step 3. 20 liters of water weighs 20 kg. 1 kg = 2.2 lbs. The author inadvertently converted the weight from pounds to kg using the conversion factor from kg to pounds.

1 reply

Thanks. Metric is not my first language.