No Hot Water – Bosch SGS5342GB/17 HYDRO SENSOR

[nisiwi]

Hello whitegoods wizards,

My Bosch dishwasher just stopped producing hot water which I guess is a broken heater element.

I’ve tracked down the part but can’t find any fitting instructions.

Can somebody point me in the right direction ? Or advise if I’m on the wrong track.

Thanks,

Nic

[Martin]

Re: No Hot Water – Bosch SGS5342GB/17 HYDRO SENSOR

nisiwi wrote: which I guess is a broken heater element.

Are you sure? It could also be the main circuit board, or low water pressure problems. 😕

nisiwi wrote:I’ve tracked down the part but can’t find any fitting instructions.

Can somebody point me in the right direction ?

Replacing the instantaneous water heater unit is a complex procedure requiring the machine to be dismantled. Ultimately the tub has to be removed to allow access. Unless you’re totally confident at such an undertaking I would advise getting a local engineer to do it for you TBH.

[nisiwi]

Re: No Hot Water – Bosch SGS5342GB/17 HYDRO SENSOR

I’m an elec engineer and have fixed a few items.

Can figure it out if I must, thought I might get some useful advice here first to save a bit of time.

I’ve not checked but once I have access I’ll check the element before I buy it, once I have access.

Being a dishwasher I didnt think there was a drum?

[Martin]

Re: No Hot Water – Bosch SGS5342GB/17 HYDRO SENSOR

nisiwi wrote:Being a dishwasher I didnt think there was a drum?

Washing machines have drums, true, dishwashers however have, what we calling the trade, tubs. To change the heater that tub has gotta go first!

Good luck! 😉

[clicon357]

Re: No Hot Water – Bosch SGS5342GB/17 HYDRO SENSOR

I managed to change my heater element on it’s own ok without having to replace the whole instantaneous hot water unit – though I know some people say its easier to do so! Ended up basically laying the machine down on its front face and taking the bottom off for access. Don’t know if any of the pictures in my thread will help. The base at the back is simply screwed on. At the front I had to dismantle the door hinge gear.

viewtopic.php?f=33&t=64526

Looking though like I’ve got to go there again as it seems to have water starvation issues!

[nisiwi]

Re: No Hot Water – Bosch SGS5342GB/17 HYDRO SENSOR

There is no luck Martin (when it comes to this), just systematic problem solving / process of elimination.

Thanks clicon357, I got that far and now I’ve gone one step further.

OK, I’ve removed the base from the tub and have access to the element.

Having removed the unit and tested it visually, mechanically and electrically it appears OK.

There is no damage (see pic).

I get about 24ohms resistance and continuity checks out OK. I could wire it up but I don’t think its necessary.

Will check the pressure sensor to make sure that its working also.

I’m pretty sure that we have good water pressure as the unit completes the cycles with cold water and there are no blockages or changes to the water system, so the element pressure switch should be triggering – although I’ve not actually checked this yet.

What else could I do to test the water pressure in the chamber for the micro switch ? Just power it up and measure if the switch is triggering ?

However, I am unable to test the heat sensor on the unit, could this have gone ?

So, the question is, could it be the pressure (don’t think so), heat sensor or the control board ?

Any useful suggestions please ?

[electrofix]

Re: No Hot Water – Bosch SGS5342GB/17 HYDRO SENSOR

as Martin stated earlier it could be the circuit board in face you have gone a lot further than i would have with this fault as you can check for heater continuity without removing it

check pcb for bad solder joints on the heater relay its very common and would have been my first choice

Dave

[Author]

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