Bosch washer dryer intermittent drying problem – clothes coming out wet!

[admin]

I have a Bosch washer-dryer Logixx 7/4 (E-NR: WVH28421GB/05 FD 9310) which has been working well since we got it in early 2015.

However, recently I’ve noticed that when I run an auto dry cycle, with about 15 minutes to go, the machine beeps 5 times and repeats this 3 times (i.e. 15 total beeps in 3 groups) whilst flashing the tap (low pressure) icon. The cycle then completes, and the washing is warm but very wet.

This happens intermittently – occasionally the cycle will complete fine without the error beeps.

I have also recently noticed that the machine has been complaining about ‘low pressure’ during filling while doing wash cycles. I have removed the fill hose and cleaned the filters. This (crossed fingers) seems to have fixed this error, but not the drying problem above.

I believe it is normal for the machine to let water in towards the end of the cycle to clean fluff – it’s a condenser dryer (I think that’s the right term!) so water in theory isn’t used otherwise during the drying cycle.

My limited research suggests that it’s perhaps the outlet pump which is starting to fail – maybe it isn’t pumping out quickly enough during the fluff clean? However, my knowledge of washing machines and dryers is limited. Any help is appreciated!

[Edit] – Just remembered, I cleaned out the outlet pump, and while it was a little gungy there was no blockage or foreign object, and it didn’t make any difference! Also, washing cycles are running fine, only drying is now a problem.

[andyjawa]

Well, with normal washer dryers rather than your complex piece of kit your problem is usually one of two things 1) either the condenser third of the inlet valve is not working or it is working but the t`other end of its pipe is blocked where there should be a restrictor of some sort as there looks to be no water restrictor valve in the water inlet valve so it must be at the other end of its pipe i.e. at the condenser end. OR 2) the condenser is blocked-up with fluff which is very common. Power off, back off, start dismantling to check. Note:Do not force anything all the parts on these contraptions are expensive so if a blockaged clean out the condenser. “I believe it is normal for the machine to let water in towards the end of the cycle to clean fluff” would`ve thought this would not be the case on tumble drying for obvious reasons. Doubtful it is a pump out problem given the machine works on wash/rinse/spin

[admin]

So I stumped up for the Bosch engineer visit, and thought I’d post here rather than leave the issue unresolved.

The beeps we were hearing represented E28 and E29 error codes. These translate as ‘I’m getting crap data from the flow meter’ and ‘I’m getting no data from the flow meter’.

So our “low pressure” warnings are really the machine not getting flow data from the sensor, and switching to a pressure-based, less efficient method of filling the machine.

Regarding the issue with the drying being soaked – the last stage of the drying cycle is using water to fluff clean the outer drum. However, because it’s getting dodgy data from the flow rate sensor, it’s using too much water during this stage and it’s getting into the inner drum and soaking the clothes.

Therefore a new pump and sensor unit is the cure, which will cost £100 on top of the £99 call out fee. Not too bad considering what a new air condensing washer dryer costs these days. I don’t particularly like the fact that Bosch machines tend to build everything in modules – meaning we can’t just replace the sensor – but I guess it makes things easier to fit. Fix in 1-2 weeks to get parts in, and the washing cycles are still fine to use in the meantime.

[electrofix]

philip.h.king@gmail.com wrote:So I stumped up for the Bosch engineer visit, and thought I’d post here rather than leave the issue unresolved.

N I don’t particularly like the fact that Bosch machines tend to build everything in modules – meaning we can’t just replace the sensor – but I guess it makes things easier to fit. Fix in 1-2 weeks to get parts in, and the washing cycles are still fine to use in the meantime.

since the fill sensor is most likely a reed sw with a revolving magnet. most of the time you can get at the reed and change it for about 50p

if its a hall sensor then its a complete valve or solder in a new chip

Dave

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