I have a rotary machine that packed upabout two months ago, it went in to be repaired, the diagnosis from the engineer was a new capacitor or something like that ! this was replaced and when i went to collect it the guy plugged it in and demonstrated the drive plate turning. i paid him and took it home.
It has sat at home since and not been used, i don't do a lot of bonnet cleaning.
Today i had a low profile carpet tiled floor in a church hall that i do from time to time, i did all the prep work including removing a hundred plus chairs, then when i was ready plugged the machine in placed the drive plate on and sat it on the pad. The drive plate went the wrong way round !!
It normally goes clockwise and when this happens it locks the drive plate on the machine, with the weight of the machine on it it wont turn at all, when tilted back off the floor it turns the wrong way

I phoned the engineer straight away, explaining what was wrong and his first comment was "it sounds expensive" i said that this was the first time i had switched the thing on since collecting it from him after he "repaired" it how on earth can it turn the other way of its own accord, it sound to me he has put it back together incorrectly in some way.
I know nothing about how these things work but something does not seem right, does anyone on here understand how these work and could he have caused this, as it does seem to be a bit of a coincidence that the first time i use it this happens, i will have to go back and do that job again but have wasted most of the day, i had to return the machine to the engineer, plus time wasted on the job. lets hope i get it back for next Monday when i am going back.