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My machine has developed the apparently common problem of being stuck in cycle with the water not heating up. Having pumped out the water as usual it just keeps rumbling away. There appears to be a small quantity of water remaining in the matrix. If I disconnect the matrix, empty it, and replace it, when I restart the machine it goes into wash again, with the pump at full force, and spraybars working properly. It subsequently pumps out as before and continues “ticking over”. Having read about the problem with the pcb I found what I thought must be the problem, a dry joint, and soldered it. It made no difference, and I have ascertained that during the cycle current is switched through as far as the microswitch at the heating element, but the switch itself does not activate and therefore no current gets to the element. I have tested the element with a meter and it appears ok. My questions are, how is the microswitch supposed to be activated, and is it possible it could still be the pcb at fault? I am considering taking a chance and getting a rebuilt pcb but I’m puzzled as to how the power is getting to the switch at the element if the pcb relay is at fault.
Re: Bosch SGS5312 – dead?
If there is insufficient water in appliance then the microswitch will not activate; thats the safety aspect of it. Its a fill level problem you have; the heating is merely a bi-product. A faulty membrane (never seen one fail) which drives microswitch a possibility.
Greg
Re: Bosch SGS5312 – dead?
Fill matrix to sump transfer pipe sludged up is the most likely culprit.
Power off when investigating.
Regards,
Penguin45.Re: Bosch SGS5312 – dead?
Try cleaning 12 inch ribbed tube from pressure unit to sump. Never had this cause a heat fault though 😕
Greg
Re: Bosch SGS5312 – dead?
Isn’t that the fill matrix to sump transfer pipe, Gegsy? :rotl: Seriously, if it underfills, there may be insufficient pressure to operate the diaphragm swith on the end of the heater box – no heat ensues.
Regards,
Penguin45.Re: Bosch SGS5312 – dead?
gegsy wrote:Try cleaning 12 inch ribbed tube from pressure umnit to sump. Never had this cause a heat fault though 😕
Greg
I’ve had that before! In my experience a blockage there restricts the circulation to the extent that not enough water reaches the spraybars. Anyway, it’s clean, first thing I checked.
Re: Bosch SGS5312 – dead?
Blimey in 10 years never had it.Although on another post someon had a lot of re-circ pump failures and no heater failures and I was reverse 😕 is it a region problem ie water ❓
Greg
Re: Bosch SGS5312 – dead?
Penguin45 wrote:Isn’t that the fill matrix to sump transfer pipe, Gegsy? :rotl: Seriously, if it underfills, there may be insufficient pressure to operate the diaphragm swith on the end of the heater box – no heat ensues.
Regards,
Penguin45.Pressure chamber to sump 😀
Greg
Re: Bosch SGS5312 – dead?
Water hardness seems to be part of it. One of your esteemed ex-colleagues was fitting heaters for fun in Scunthorpe IIRC.
OK, so what is left for our poster? Thermostat failure – awkward – on top of heater box. Wiring broken in the door – possible but unusual on this range. Or – the digital board itself has failed. Likely……..
Regards,
Penguin45.Re: Bosch SGS5312 – dead?
Wire broken in door NEVER in this new breed of bosch.
He did say microswitch DOESNT activate which would indicate insufficient water circulation / blockage; back to you Chris.Greg
Re: Bosch SGS5312 – dead?
Just an after thought………. Nottheboschman are you using 3 in 1 and rinse aid aswell?????
Greg
Re: Bosch SGS5312 – dead?
It’s running at the moment – there certainly appears to be plenty of water circulating, spraybars operating fully…..I just can’t follow how it can be the pcb if the juice is getting through to the microswitch. I suppose it might be worth a gamble though…..
Re: Bosch SGS5312 – dead?
gegsy wrote:Just an after thought………. Nottheboschman are you using 3 in 1 and rinse aid aswell?????
Greg
We’ve never used 3 in 1 rinse aid. But I must confess I haven’t always topped up the liquid rinse aid as soon as the indicator light comes on!Re: Bosch SGS5312 – dead?
Thats fine, you DONT have to use rinse aid. It was just if you had used 3 in 1 and rinse aid in conjunction; excessive foam would have been generated and caused problems esp in circulation and heater microswitch.
It may be time for an engiineer in all fairness try repairs@
Greg
Re: Bosch SGS5312 – dead?
gegsy wrote:Thats fine, you DONT have to use rinse aid. It was just if you had used 3 in 1 and rinse aid in conjunction; excessive foam would have been generated and caused problems esp in circulation and heater microswitch.
It may be time for an engiineer in all fairness try repairs@
Greg
Nobody in my area under repairs!
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