RCD Tripping when two MCBs are on (Upstairs & Downstairs sockets)

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10 Jan 2021
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First time post...

The RCD trips when both the upstairs sockets/kitchen MCB & the downstairs sockets are on.
When they are on the RCD will not turn on.
It happened a few weeks again but switched back on fine the has been happening more and more frequently until today when it wont switch on at all.

The main board is on a fine... this is a separate RCD with 3 MCBS (Cooker, Sockets, Sockets/kitchen)

Any help would be greatly appreciated!!!
 
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Also, unplug (not just switch off) every portable appliance. Every fixed appliance, turn off at the wall isolator. Does the RCD still trip?

Now, one at a time, turn on
-the cooker and oven
-the immersion heater
-the boiler
-the outside lighting and socket
-the dishwasher
-the washing machine
-the kettle
-the PC
-the coffeemaker
-the tea urn
-the microwave
-the fishtank
-the fountain
-the jacuzzi
-the shed supply
-the hot tub.

Do any of these cause a trip?
 
I've taken all the plugs out of sockets & turned off the appliances via switches
 
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Ive unplugged everything and the RCD won't switch on with the two socket circuits on
 
DB.jpg
 
I had the cooker circuit on but even that just trips the RCD after a minute or two now... not the MCB aren't tripping
 

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