Bosch SGS6612GB/12 main circulation pump not running

[paltibine]

1 – 4 11.7 ohms
1 – 2/3 34 ohms

[paltibine]

The grey wire goes up to the control board where it is connected to some sort of switching device – transistor or whatever. This looks in perfect condition but could be the problem.

[electrofix]

well they look like the sort of values a motor would give so it means the coils are probably ok

Dave

[paltibine]

OK, that looks sensible for the motor.
So the relay terminal, the one on it’s own not connected to the motor seems to be connected to a wire that is permanently live.
The wire on terminals 2/3 seems to be connected to that via the relay.
The grey wire on terminal 1 comes from the control board and has no volts on it at all.

Do you know which terminal is wrong voltage and what needs to change to get the motor to run? I’m confused?

[electrofix]

Am a bit lost now myself. Can’t figure what they need 3 wires for.

resistances seem ok and voltages seem to be there but it’s not running.

If it was me I would be testing the voltages on the 3 wires while it was running then pausing it to see if things change

Dave

[paltibine]

Yes that was the first thing I did really. Mains on the relay terminal all the time (looks like it comes from the main switch area) and probably through the relay onto terminals 2/3 of the motor so that’s there all the time. The grey wire on terminal 1 comes from the control board and never has any voltage on it.
I connected up the 2 white wires but not the grey, waited till the pump should be on and very carefully touched a wire from neutral to terminal 1 and nothing happens.

[electrofix]

not sure you know what i mean

assume you made these measurements with one lead on the earth ( metal chassis)
what i am trying to find out is if there is 240v across the motor and also does that reading change if you open the door and stop the machine. in other words is the timer feeding a voltage to the motor and does it turn on and off

you need to take the readings across the motor and relay terminal and present it in a table

so motor has 4 terms 3 2 4 and one but we know 3 and 2 are the same. the relay also has a terminal ( will call it R) so that make 4 connections

so measure
_______running__ not running
R to 3 ___???____???
R to 4 ___??? ____???
R to 1___ ??? ____???
3 to 4______?____ ??
3 to 1______?____ ??
4 to 1 ______? ___??

what i am looking for is a supply to the motor that goes on and off if you open the door to try and prove the timer is feeding the motor

just a pity this is so old i cant find any tech on it

Dave

[paltibine]

Hi Dave,
I think from what I’ve seen that the timer board is the problem and since I’ve found another similar one for £50 I don’t think it’s worth carrying on with it.
Thanks very much for your help – it is appreciated.

[Author]

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