Bosch Wfo2866gb/07 No Motor

[bobokines]

Hi

Can someone help me to diagnose this one please.

Wfo2866gb/07 Two and a half years old and low usage.

I’m not sure whether to blame the motor or the module. After one minute of pump out, the motor ramps towards spin and aborts instanty. It tries again twice and then cancels the program and “01” appears in the display.

My feeling is that there is no tacho feedback but I cannot find any bad connections on the motor harness or the module connections. (I am not sure how to read the correct resistances on the motor.)

Any advise before I order a new motor?

Many thanks

Bob

[clivejameson]

Re: Bosch Wfo2866gb/07 No Motor

IIRC the motor connections are in pairs in the connector block Bob…ie armature pair next to each other, field pair next to each other and same for tacho. Again IIRC the reading for the tacho is in the order of 16-18 ohms?

When the motor ramps up does it run nice and smooth?

[bobokines]

Re: Bosch Wfo2866gb/07 No Motor

clivejameson wrote:

When the motor ramps up does it run nice and smooth?

Didn’t get a chance to. It aborts within half a second. Seemed smooth though.

Bob

[gegsy]

Re: Bosch Wfo2866gb/07 No Motor

Hi
Check your email Bob 😉
I would put money on module if motor and loom are ok and no earth leakage 🙂

Greg

[bobokines]

Re: Bosch Wfo2866gb/07 No Motor

Thanks Greg. A bit of bedtime reading :rolls:

Bob

[gegsy]

Re: Bosch Wfo2866gb/07 No Motor

bobokines wrote:Thanks Greg. A bit of bedtime reading :rolls:

:look:

[bobokines]

Re: Bosch Wfo2866gb/07 No Motor

Follow up on this one.

It turned out to be the motor. Surprisingly, I can’t find anything wrong with the motor with the test meter. Resistances of tacho, arm and field were exactly the same as the replacement motor and the earth reading was infinity.

Wondering if the fault may be intermittent on the module, I reconnected the old motor to make sure, but the fault followed the motor.

Although the machine is now working and everyone is happy, I would still love an explanation of the fault! I hate not knowing!

Bob

[clivejameson]

Re: Bosch Wfo2866gb/07 No Motor

Does the tacho magnet have a crack in it?

Just a thought…. :con:

[bobokines]

Re: Bosch Wfo2866gb/07 No Motor

That’s the only thing I could come up with. We’ll never know for sure as I left the motor with the customer.

Bob

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