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Re: Bosch SMS4472GB sticking in the wash cycle
I had a test run yesterday.
The logic is clear.
The machine washes with cold water till it reaches the brush symbol. At that time the timer is disabled and the heater turns on.
Once the temperature reaches 65C the thermostat clicks and the timer moves, immediately the power to the heater is cut.
At this point, it doesnt matter the thermostat opens again because the timer proceed by itself.
It goes this way till it reaches the rinsing cycle, close to the sun symbol the timer stops again, heater goes on, and it waits till the thermostat closes. Immediately the heater goes off and timer restarts (even if the thermostat opens again the heater doesn’t come on again and the timer doesnt stop).
Then the heater goes on when the drying cycle starts.Unfortunately the thermostat I have got is rather unreliable, sometime clicks and closes, sometime just clicks but there is no power to the timer..I guess over time the contacts have sparked out as there is no capacitor between them…will see how it goes with the new one.
Regarding the other thermostats, they do not have “proper” contact with the element, and for what I see they should be 85C cutoff thermostats. The element is certainly running hotter than 85C as it boils water on contact!Bosch SMS4472GB sticking in the wash cycle
Your observations spot on except for the 85deg stat in that it does isolate the heater to prevent boiling. Go buy the 65stat I gave you the part number of and a new 85 safety stat and rubber grommet and you’re all set! 😀
Re: Bosch SMS4472GB sticking in the wash cycle
Hello
I already ordered the 65C stat..its taking a while to get here..
In the meanwhile I disassembled the old thermostat (65C) and the contacts are completely covered by a black gunk. No doubt it did not make any contact even after tripping.
I scraped out the black gunk and now contacts are clean, but I will anyway wait for all the spares before putting things back together.Re: Bosch SMS4472GB sticking in the wash cycle
alright
the problem is now solved.
new/old 65C and new/old 85C thermostat solved the problem.
The machine has 2 85C thermostats, one of them was tripping at 50C. I opened and gave a look, the contacts were completely blued and badly burnt…Now the machine is back in shape.Re: Bosch SMS4472GB sticking in the wash cycle
Of course I thank you Martin! Without you I wouldn’t have even found the thermostat! Writing of the phone is always a problem… Something gets corrected or vanishes! Thank you all for your hell p
Re: Bosch SMS4472GB sticking in the wash cycle
Alright, after a couple of good washes I can now say that the issue is solved.
Machine washes fine and quickly.
I would have liked to drop a bit the washing temperature to 55C but I could only find a 65C spare thermostat.
What puzzles me is the two 85C cutoff thermostats. They are cycling several times during the wash..I suppose its normal tho.
Hopefully the recycled thermostat I put should run for quite some more time and provide good service for the coming years..
Thanks to everybody for the help in solving this.
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