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I was called out next door neighbour machine not heating, so she had been filling it on a 90 wash and putting it back to 40.
Tested heater open circuit fitted new heater with NTC/Thermistor and left,Customer put it on a 90 went out for 8 hours and came back to a steam bath.The machine must have kept boiling emtying machine and refilling.
What I can’t figure out that there is no safety cut out! so I presume this is a board fault. Apart from destroying machine plastic tub has warped as well as facia etc it has also warped and blistered all the fitted units in a new kitchen.
I supposed lucklly it kept filling when it boiled the water away and didn’t catch fire.
Has anyone else had this fault how would you check for a board fault with a simple open circuit heater, so now one will have to tell the customer it might have another fault and to watch it on the first few washes good for customer confidence.Kirk
Re: Bosch Max WFL2800 Boiling
Kirk,
First of all I’m a bit puzzled with the model number as I and Bosch do not recognise it ❓
Secondly, on any of the later Bosch/Siemens range one cannot fill a machine on 90degrees then switch to 40 without first ‘resetting’ the programmer. If you did such a thing it would simply continue with the first option selected, namely a 90 deg cycle 🙁
Finally, replacing the heater/ntc assy was a good move and should have cured the fault but that’s only assuming the NTC plug/lead terminals to the Module were in order? It is (IMHO) not a known module fault, but who knows maybe with the lady screwing up the programme, anything is possible 😯
Did you check the air pressure chamber when you changed the heater I wonder ❗
Martin
Re: Bosch Max WFL2800 Boiling
Thanks for the reply Martin,the model number may not be correct as I did not need to order anything and had heater in stock.
Pressure chamber was the first thing I checked it is a common fault in this hard water area.
I did wonder how she could fill on 90 and move it on as generally they MT and restart but did not give serious thought, most other machines one has pause or cancel before you can change it.
But you did not say if you had come across one boiling in this way how can it do it?Kik
Re: Bosch Max WFL2800 Boiling
Sorry Martin did not read all your reply properly.
The NTC plug was all correct as I have come across that before, but of course did not test it back to module! I would have thought a fail safe system would have been built in to stop overheating in such an event.Kirk
Re: Bosch Max WFL2800 Boiling
It does worry me these days that most appliances have dispensed with safety stats. Do they really think the electronic controls are 100{e5d1b7155a01ef1f3b9c9968eaba33524ee81600d00d4be2b4d93ac2e58cec2d} reliable? Seems like this one doesnt even have a fused heater.
We came across a miele the other week which was even worse as the heater relay is straight off the terminal block, even the on off switch wouldnt turn the heater off!Yes Mark, too true!
A Samsung I had the other week had overheated to the extent that the soap drawer had melted! Thankfully Samsung just exchanged the machine, but still that can’t be good.
K.
Most heaters these days have internal temperature fuses just infront of the terminals. Begs the question why they didn’t trip on Kirk’s machine if it really did boil dry?
Chris.
Re: Bosch Max WFL2800 Boiling
Hi Penguin, I did not know of internal fuses? to me this is just a straight forward element with an NTC.
The machine of course did not boil dry every time it boiled water away it refilled, of course if the customer had not been out for 9 hours it would probably just melted the facia.
I can not comprehend no thermal safety cut out now adays, how much would it cost?
Surely if the message from the NTC does not register on the board there should be a simple cut out.Kirk
Re: Bosch Max WFL2800 Boiling
It’s probably not the part cost Kirk, it’ll be an extra operation in assembly which can be removed, thus saving costs.
Heaters with a slightly extended plastic sleeve behind the terminals tend to have internal fuses. Bleckmann heaters spring to mind, as used in Hotpoint, Whirlpool and Bauknecht machines.
Cheers,
Chris.Yes P, but they are not foolproof nor any more reliable IME than the old way of doing things, as experience has probably taught us all.
But you are quite correct in stating that it all comes down to production costs, it’s bugger all to do with anything else.
Many moons ago I had a go at Candy as for the Electra branded fridge freezer range they did a nice green tint to the interior fittings, it was nice at the time okay. Anyway, the sales director explained that to do it across the range which would maybe or maybe not have enhanced sales would cost £1 per unit which I thought was insignificant. Until he pointed out that they would have to apply that to 100,000 units a year minimum, that opened my eyes to the importance of production costs.
K.
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