Hello !
I am the owner of a Bosch Classixx 7 Vario Perfect (ref: WAE24368GB) washing machine that got a bit temperamental lately
and I hope you can help me to fix it.
Here are the symptoms: at the start of a wash program, the drum behaves normally. It spins normally for about 10 seconds and then stops for 10 seconds as it should. It then starts to turn for a few seconds and then suddenly accelerates for about a second and stops. In the next cycle, the period in which the drum is rotating normally further reduces, the motor going earlier into its sudden acceleration phase. After a few minutes into the program, the motor only runs normally for about a second, accelerates suddenly and then stops.
When listening to the relay clicking, the sequence of even is the following:
Relay click => motor rotate normally => motor suddenly accelerate => relay clicks
This suggests that there is an overcurrent mechanism that triggers and switch of the motor supply with the relay.
Here is what I checked so far:
- Motor brushed are fine: still very long and nicely cut
- Armature winding is fine (measured between the two connector pins)
- Stator winding is fine (measured between the connector pins)
- Position sensor is not in short circuit (reading 23ohm when motor stator doesn’t turn) but I was unable to check anything else about it
- A visual inspection of the power board and control board didn’t identify any damaged component
Any idea?
Thank in advance for your help
.
I am the owner of a Bosch Classixx 7 Vario Perfect (ref: WAE24368GB) washing machine that got a bit temperamental lately
and I hope you can help me to fix it.Here are the symptoms: at the start of a wash program, the drum behaves normally. It spins normally for about 10 seconds and then stops for 10 seconds as it should. It then starts to turn for a few seconds and then suddenly accelerates for about a second and stops. In the next cycle, the period in which the drum is rotating normally further reduces, the motor going earlier into its sudden acceleration phase. After a few minutes into the program, the motor only runs normally for about a second, accelerates suddenly and then stops.
When listening to the relay clicking, the sequence of even is the following:
Relay click => motor rotate normally => motor suddenly accelerate => relay clicks
This suggests that there is an overcurrent mechanism that triggers and switch of the motor supply with the relay.
Here is what I checked so far:
- Motor brushed are fine: still very long and nicely cut
- Armature winding is fine (measured between the two connector pins)
- Stator winding is fine (measured between the connector pins)
- Position sensor is not in short circuit (reading 23ohm when motor stator doesn’t turn) but I was unable to check anything else about it
- A visual inspection of the power board and control board didn’t identify any damaged component
Any idea?
Thank in advance for your help
.
. Let's start again: whatever the program, the drum only rotates properly (at low speed as it is the wash part of the program) for a few minutes. After this period of time it goes into very brief acceleration phase (which it should not do at that stage of the program) and stops. It will rotate again a few seconds later as the timer kicks it in but will go into the same phase: a few normal rotation => short lived acceleration => stops rotating. It seems to me that in the power PCB one of the component is getting hot (the triac?) and put too much current into the armature of the motor. The controller then detect an over current and switch of the relay. But I am not too sure how I can prove this theory...