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Author Topic: S5211 - Replacement Motor - Blown Controller - My Fault!  (Read 2712 times)

Offline pm1961

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S5211 - Replacement Motor - Blown Controller - My Fault!
« on: November 13, 2020, 08:37:51 PM »
Hi there,

Looking for the benefit of your collective experience please!

My much treasured S5211 blew its motor (742/84-42/2) and I looked for a replacement without success......


From here, I take the much coveted "Dick of the Day" award, so bear with me please.......

I decided to take a punt on another Miele motor, identical externally, but a different reference number (720-42/2). Cos they're all the same aren't they???? Of course they're not!

I wasn't bothered if it wasn't rated to the full 2200W, it just needed to work.....

What I didn't bother to check was the pin out of the connector on the motors..... In my rush to see if it worked, I plugged it in and turned it on. The motor briefly started and then a bang and flash from the controller board and.... silence.....

The only damage I can find is a blown surface mount component on the back of the board. That's a shame, because if it was one of the larger discrete components, I would have been confident of repairing it.


My limited knowledge of single phase motors has them having three wires. One forming a "starting" circuit with a capacitor, and the other being the "running" circuit.

Why does the existing motor have 4 spade connections? Any ideas?

What's annoying is that had I bothered to examine the connectors and rejig the harness plug, it would probably have worked..... I think.......

So, my plan, if the right motor doesn't become available at the right price, is to get a new controller.... re-jig the harness plug.... and try again.....


What do you think??

Take the mick if you like.... It is Friday the 13th!

Online MVacs

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Re: S5211 - Replacement Motor - Blown Controller - My Fault!
« Reply #1 on: November 15, 2020, 06:35:11 PM »
Miele motors are a minefield and we avoid them for these types of reasons. A 'spares or repair' machine on eBay may be the only way to get a reasonably priced spares.

Ryevac will be able to repair that board if you cant get one. The circuit question is also one for him, I'll link him to the topic.

Offline Hoover Master

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Re: S5211 - Replacement Motor - Blown Controller - My Fault!
« Reply #2 on: January 12, 2021, 11:00:09 PM »
Got plenty spare boards so would be happy to help if needed, got a few motors too that run but they need work



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