Bosch Exxcel Dishwasher not advancing beyond wash and heater not working

[jmgordon]

Bosch Exxcel Dishwasher
SGS47E02GB/56 FD8502

As the FD code indicates, we have had this Bosch dishwasher since March 2005 and it has given excellent service. Today on a quick wash we realized that, although the timer had wound back to 0.01, it had not advanced beyond the wash cycle. Both arms are turning freely. Stopped with water in the sump, which I scooped out and found some vegetable debris, but not sufficient to block completely. Removed the pump cover and checked the pump is clear. Repeated the exercise in case it had been a pump issue, but then realized the water had not heated. Perhaps this is the reason for the lack of progress?

Is this repairable or terminal? Are the parts likely to be needed still available?

Although I have changed brushes on a washing machine, I guess this may be a bit more challenging. I have looked at a couple of videos, which seem to show completely different assemblies! Unfortunately, in these tricky times, inviting professionals into the house may be awkward.

John M Gordon

[Mihangel]

If you feel you’re up to, take out the control module and open it up and have a look to see if there’s a dry joint on one of the solder terminals. If so a blob of solder will fix it.

[electrofix]

Mihangel wrote:If you feel you’re up to, take out the control module and open it up and have a look to see if there’s a dry joint on one of the solder terminals. If so a blob of solder will fix it.

just to clarify
the heater is controlled by a relay. Its common for the solder joint on the relay leading to the heater to fail

clean the joint and resolder. if bad you can scape the print to increase solderable area and add a piece of 15A fuse wire to add strength

Dave

[jmgordon]

Thank you for that, both of you. I have found a video indicating the dodgy area of the PCB (and another showing how to remove the module). I’ll investigate and report back. I expect the comment about adding 15A fuse wire will become clear when I have looked at it.

John

[jmgordon]

Job done! Removing the control module wasn’t quite as shown on the video, but I managed it and accessed the PCB. The relay connection had evidently eventually arced, judging by the smoke and spatter.

Thank you for the fuse wire tip, as I couldn’t get the pad to take properly, so I bridged to another connection on the same pad. I don’t know how long it will last, but it works for now and I have saved £125 for a new module.

Thanks for your guidance.

John

[electrofix]

if your solder is good there is no reason it would fail

while you were in there did you solder both relay main contacts? if not it poss the other one may fail

Dave

[jmgordon]

No I didn’t, the other connections looked bright, and it didn’t occur to me. Well, if it goes at least I know what to do!

John

[electrofix]

bear in mind this is one of the best units boash has made
the new ones are junk in comparison, so within reason its worth repairing

common fault on the new ones when it stops heating is a complete motor change, and they go a lot
heaters in yours, dont think i have ever changed one its always stats, broken wires or the solder contact

Dave

[Mihangel]

electrofix wrote:bear in mind this is one of the best units boash has made
the new ones are junk in comparison, so within reason its worth repairing

common fault on the new ones when it stops heating is a complete motor change, and they go a lot
heaters in yours, dont think i have ever changed one its always stats, broken wires or the solder contact

Dave

Absolutely, these ones are literally indestructible though I doubt that they deliberately designed them that way. I regularly come across these that are happily plodding on after 20 years of service. The only other thing I’ve found is that the pressure chamber and fill hose block up if they’re only ever run on a quick wash

[Author]

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