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Are you allowed to replace an RCB yourself?

You should have an RCD rated to the current that will be running through it.

Having said that, replacing a 16A RCD with a 32A one will not help stop it tripping on overload as an RCD has no overcurrent protection.

It is tripping because there is a fault somewhere. I assume the alternative supply for the treadmill that "works" is not RCD protected?
 
I must say I have had a Decathlon mill for a good many years and my RCD has tripped twice in that time, once due to a faulty TD and once due to flood.
But, never say never!
 

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