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Bosch SG143EGB02/16 salt problem

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by ChemistInTheKitchen » Thu Feb 23, 2017 10:17 am

Hi

I have one of these Bosch dishwashers (installed 12/2005). I noticed a couple of weeks ago that the "low salt" light hadn't come on for a long time (maybe a month or more); more recently there's been a build-up of white powdery film on the inside surface of the machine (presumably limescale, our water is reasonably hard) - so today I decided to add salt (in spite of the low salt light not indicating that would be required), but found that the inside surface of the screw-on lid to the salt reservoir on the water softener unit is crusted with common salt (see pic) - this deposit is not lime scale.

Some of the salt deposit was on the surface of the black elastomer sealing ring - could it just be that I hadn't screwed the cap home?

What steps should I take to try to locate/fix the problem?
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dishwasher-0.5.JPG
salt reservoir lid with salt crust
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by ChemistInTheKitchen » Mon Mar 20, 2017 1:53 pm

Hi

I'm a little surprised that no-one pointed out I had the model number wrong - should be SG143E02GB/16.

However, since my original post I've flushed out the salt reservoir with clean water (multiple times) and found that the low salt indicator appears to be U/S. The switch for the indicator appears to be located on the salt reservoir itself, but that's part of my next problem - I don't know if it's the switch or the electronics module behind the on/off & programme switches.

I've had a look at removing the switch from the salt reservoir, but my fingers aren't small enough to get in there - so I wanted to remove the reservoir, but find that the large plastic water inlet manifold (on the LHS of the d/w as seen from the front) holds it firmly in place (after having removed the ~80mm octagonal nut fixing the salt reservoir to the base of the dishwasher) . The only thing I can see that holds the inlet in place is a sealing ring (approx 70mm dia) - but I don't know if this pulls off, or screws off, or what - so, my Q is -

How do I remove the inlet water manifold so I can remove the salt reservoir (or do I even need to do that?)?
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by Martin » Mon Mar 20, 2017 3:01 pm

2 options are available to avoid replacing the whole darn softener unit simply because the light no longer comes on.

Firstly, replace the Reed Switch (part no. 00166876) as that usually is the reason it fails.

Secondly, do nothing, touch nothing. Instead simply top up the salt every 3 weeks or so (on the assumption you use it once a day) A full salt container has sufficient salt for 20 wash approximately.

HTH? :D
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by ChemistInTheKitchen » Fri Apr 07, 2017 12:22 pm

Hi

Many thanks for this.

Sorry for the delay in responding - I was waiting for a notification to my e-mail inbox (which may have been spam filtered out, so I don't seem to have received anything).

Changing the reed switch would be my preferred (longer term) option (it's nice to have warning lights working if they're installed...). Looking at the diagram on the Bosch website it looks like it's held in place by a single screw and (presumably) does not require removal of the water inlet manifold or the salt reservoir. I'll let you know how I get on.
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by ChemistInTheKitchen » Tue Sep 12, 2017 11:00 am

Eventually I've got round to dealing with this.

I followed option (2), i.e. just filled up with salt and carried on using the machine.

The salt level hasn't changed in several months - there is loads of solid salt in the reservoir, and salt crusting on the inside of the filler cap, so it looks to me as if there is no salt being used. Once a month or so I've been descaling and "it seems to work"

I have checked the regeneration valve on the salt dispenser - it moves freely and has a resistance of ~2.3kOhm (from memory, it's a while since I tested it), so it's not open circuit or short circuit.

This leaves me with a decision to make - is it worthwhile replacing the reed switch, or does it indicate that a new softener unit is required? What other tests should I do before deciding?

Re: the reed switch, what rating is it? I'm more than happy to do a bit of soldering to replace a ten-bob (okay, realistically a couple of quid) reed switch.
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by Martin » Tue Sep 12, 2017 12:01 pm

No salt being used means that the salt regeneration valve is not working. A new one cost under 20quid.(part no: 00166875)
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