Wednesday, July 06, 2011

 

Bosch Washing Machine Fault Code F04

The fault code (error code) F04 on a Bosch Washing Machine means that the machine hasn't been able to pump out. Most likely this will be because of a small foreign body making it into the pump housing - but it is worth a visual check for a kink in the drain pipe as that would be even easier to fix.

Before doing anything, remove the mains plug.

The key is to remove the access and drain plug. But unless you can cope with 10 litres of detergent-laden water all over the floor, first you need to drain most of the water from the machine. Pull down the flap at bottom right hand corner, look for black flexible hose (approx 1cm diameter) with rubber plug in the end. Take a plastic carton (a 3-litre washing liquid carton is ideal) and drain into that - placing a drip tray underneath (eg a shallow baking tray). This is a slow job!

When there is no more liquid coming out of the small pipe, replace the bung. Then undo the big (10cm diameter) access plug by unscrewing it. See my other note about using Polymorph to improve grip if you can't turn it by hand. Be ready for quite a bit more liquid when you remove it.

Check again that the power is off, then feel inside the pipe that you've just exposed - there are two pipes entering the chamber, and a four-blade impeller at the back. This is where that small coin will be if that is the problem.

If you need to explore further, you can remove the pump entirely - and it's not too scary a job (well done Bosch). Turn the machine onto its side and remove the eight Torx screws holding the centre access panel on the bottom of the machine. Remove the plastic moulding that covers the access knob at the bottom of the front face of the machine (1 Torx screw) and then remove a very small Torx screw at the bottom of the access pipe (ie the bit the access knob screws into): note how this fits for when you put it back. Removing the screw will allow you to remove the pump from the body of the machine, and that makes it easier to remove the two pipes that fit onto it (spring clips around the rubber pipes).

POSTSCRIPT
Having hit increasingly frequent F04 errors (opened up, found no blockage but a residue of rather thick washing liquid), I feared that there was something seriously wrong - perhaps the impeller slipping on its shaft.

But in fact I have banished the errors by moving to use a "wash-ball" (plastic container the size of a tennis ball with a slice cut off  - washing liquid goes into this which then goes into the load) rather than the drawer.

Comments:
This was useful to me. Thanks.
 
Thank you, this has been so helpful!
 
This was very useful-thank you so much!
 
Really useful and claer - thank you
 
Read your very helpful blog - thanks!
I wondered if you or commenters can explain the behaviour of my Bosch WFX2868:
F04 is displayed on the mc starting to drain. If switched to off, mains off then on again, then switched to spin > start, mc drains no problem, and completes the spin - all ok.

FO4 still happens though.


Any views on this appreciated.

Thanks,
Robin
 
105Excellent advice thank you......10 minutes work and out popped a 5p piece!
 
Great, thank you. Followed and removed the pipes from the pump after I originally couldn't find anything and found a 5p blocking.
 

Thank you!!!WFX160 Bosch new OK again!
 
I took one apart 6 months ago and found no blockage at all, what I did find was a tight pump blade, I slid the coil off the pump and was left with a plastic body with the shaft inside I managed to prise it open and cloudy water came out I managed to oil and free it up and got another 6 months out of it so far but looking back the part can be purchased for around 40 quid great machines to work on!
 
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