High level in toilet after flushing

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After flushing my toilet the water level goes higher than normal for a few seconds as if blocked but then returns to normal. It is not doing it all the time but intermittently, and it’s not even a case of it doing it when paper is in there. I have tried a plunger and there is no obvious blockage. Could there be something faulty with the flush mechanism?
 
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Have you got an external manhole? I’d look in that while someone flushes the toilet.
 
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Upstairs or downstairs toilet?

My guess it is the downstairs, which means a partial blocked manhole.

Andy
 
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Thanks will look into the manhole, it’s only one toilet upstairs
 
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