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PostPosted: Wed Aug 23, 2017 6:28 pm 
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Hi all,

We recently got given a dishwasher in pretty good nick, I plumbed it in and away we went, we've had it less than a month and it's ran absolutely fine since putting it in. We ran a load last night and it was fine, we went to run a load this afternoon and it wouldn't switch on, I pulled the dishwasher out and had look at the plug and noticed some burn marks around the pin and upon checking the fuse, that was blown and there was what I can only assume to be corrosion on the inside of the fuse holder?

Can anyone advise me further on what to do to remedy this? Can the wire be cut and a standard 13a plug wired on or should I contact Bosch for further advice? I've checked whether it's a faulty appliance on a recall and it isn't so I'm not sure whether it scrap it and get a new one or wire a new plug on.

But any advice in the meantime would be great,
Thanks! :thumbright:


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PostPosted: Wed Aug 23, 2017 6:47 pm 
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Not knowledgeable on electrics but I have a Bosch that is 22 years old and still working well. Yes you can cut that off and put a new plug on but the marks are worrying. It looks like a poor connection has been arcing and this could be the plug or even the wall socket. I am sure the sparks will be along soon to answer this properly.

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PostPosted: Wed Aug 23, 2017 6:50 pm 
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Could be a bad connection inside, Being a moulded plug makes it hard to check of course. I would cut it off and replace and then autopsy the bad plug.



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PostPosted: Wed Aug 23, 2017 7:24 pm 
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Live pin melting... probably a loose connection inside the socket. Lecky off and remove the socket plate, report back if there are any signs of charring. with photos.

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PostPosted: Thu Aug 24, 2017 6:12 pm 
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Replace both the socket and the plug. It costs less than £5 to do so.


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PostPosted: Mon Aug 28, 2017 6:47 pm 
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I popped the socket off the socket and all seemed okay inside (pic provided) and there was no charring or burns on the faceplate, the Bosch engineer was booked free of charge due to the nature of the issue, I'm going to see what is said by them tomorrow and if more work needs to be done, I'll look into it myself, either way I'm not out of pocket so I'm happy, besides the fact whatever tool made additions to the kitchen circuit when the Housing Association did the refurb' changed the MCB so it switches the upstairs sockets and not just the kitchen sockets, which resulted in a very angry sibling. :lol:


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PostPosted: Mon Aug 28, 2017 7:57 pm 
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it will be a internal fault what you cant see without taking it apart, as above change the socket (£1.50 - £2.50) and plug (£1.00 - £1.50)


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PostPosted: Tue Aug 29, 2017 12:46 pm 
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The engineer said the capacitor had discharged and as a result blew the fuse and live pin, he stuck on a whole new plug assembly on the dishwasher and PAT tested it so all should be alright now and didn't cost me a thing so I'm not complaining :mrgreen:


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PostPosted: Tue Aug 29, 2017 12:55 pm 
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Must be some capacitor to heat that up like that!

The cause of the melting was a bad connection somewhere. Either fuse to carrier, or by the look of it, pin to socket internal connection.
As already said you can't always tell what has gone on with the internals of a socket by looking at the exterior.
I'd have changed the socket as a matter of course after having a plug pin melt like that.


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PostPosted: Tue Aug 29, 2017 12:59 pm 
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The engineer is talking rubbish, it was probably that the fuse was loose in the Bosch supplied plug. Happy you got it sorted though. :-)



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PostPosted: Tue Aug 29, 2017 1:19 pm 
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Starting caps can pull large amount of current when they go faulty I have seen it before a long time ago - iirc there 10-20 uF 425-450v


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PostPosted: Tue Aug 29, 2017 1:33 pm 
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flash22 wrote:
Starting caps can pull large amount of current when they go faulty I have seen it before a long time ago - iirc there 10-20 uF 425-450v


Yes they can supply a lot of current, but only for a very short time.
Enough to heat up that pin like that? Very doubtful I'd have thought.


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PostPosted: Tue Aug 29, 2017 5:59 pm 
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Dave54 wrote:
flash22 wrote:
Starting caps can pull large amount of current when they go faulty I have seen it before a long time ago - iirc there 10-20 uF 425-450v


Yes they can supply a lot of current, but only for a very short time.
Enough to heat up that pin like that? Very doubtful I'd have thought.


the motor is inline - a stalled motor and overloaded the cap its possible, I'm surprised it didn't trip the breaker - then again why would it


Edit. the OP must of had one of the recalled models hence FOC repair

https://dishcareaction.com/en-gb/bosch


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PostPosted: Tue Aug 29, 2017 6:09 pm 
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flash22 wrote:
Dave54 wrote:
flash22 wrote:
Starting caps can pull large amount of current when they go faulty I have seen it before a long time ago - iirc there 10-20 uF 425-450v


Yes they can supply a lot of current, but only for a very short time.
Enough to heat up that pin like that? Very doubtful I'd have thought.


the motor is inline - a stalled motor and overloaded the cap its possible, I'm surprised it didn't trip the breaker - then again why would it


I see what you mean. Yes possible as you say. The OP did say that it was a capacitor discharge that did it though.
I looked up what a 10 uF cap can hold on 230V.
http://www.engineeringtoolbox.com/capac ... _1389.html
Saved me working it out! :-)
52kW apparently, but only if discharged in 5 micro seconds.


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PostPosted: Tue Aug 29, 2017 6:11 pm 
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Dave54 wrote:
Yes they can supply a lot of current, but only for a very short time.
Enough to heat up that pin like that? Very doubtful I'd have thought.

Maybe the cap was inside the plug :roll:
The mind boggles. It is, as you know, a knackered plug and sod all to do with a capacitor.

Personally I would, after that amount of heat has been generated in such a small space, replace the socket.



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