Following descale during the following rinse RCD keeps tripping

The grill element has an internal short and needs replacing. Sometimes you can see it as a slight bulging of the element. This happens just before it blows a hole. It may also have been physically damaged when something was put in there after a few Sherries. :>D Sounds like your RCD is adequately sensitive.

The modern fusebox contains two types of breaker; the micro circuit breaker (mcb) that replaces the old fashioned fuse and the residual current device (rcd) and which one trips indicates the type of fault.
The mcb trips in response to an overloaded circuit or short circuit and the rcd trips when current leaks from the circuit to ground.

When a washing machine does this there is a strong possibility some water has found a way to mix with the electrics. The first task will be to examine the power cord and then to remove whatever covers can be removed for a close examination of the internals looking for evidence of water...

yes
an accredited electrician can test the circuits for insulation failure , vermin shorting across active / neutral/ earth points and the rcd itself
it is not a diy job

probably you have to rinse the machine and then it will be work!

Is your FREEZER is plugged into a wall socket which is protected by an EARTH LEAKAGE UNIT or RCD [Residual Current Device] ???
Most manufacturers advise NOT to have this type of appliance connected through an RCD as the start load required when the COMPRESSOR "kicks in" is quite large [especially in larger fridge/freezer units] AND will quite often TRIP your RCD. These appliances are better connected to a separate electrical circuit if at all possible and not protected by an RCD.

17.3 Descale
Over time, the continuous heating up of the water used to make the coffee leads to lime scale building up in
the inner circuits of the appliance.
When the message:
DESCALE
flashes on the display, you should perform the descale cycle.
Proceed as follows:
• make sure the appliance is ready.
• press the P button (the light over the button comes on) then press the button repeatedly until the
appliance displays:
DESCALE No
• Press the button (corresponding to the SET symbol flashing on the display) and the appliance will
display:
DESCALE YES
• Press the OK button to start the descale programme.
• Empty the tank and pour in the contents of one bottle (125 ml) of DURGOL descaler plus one litre of
water.
For subsequent descaling, use descaler of the same type and brand as supplied (available from technical
service centres authorised by the manufacturer).
• attach the water spout to the nozzle;
• place a container with a minimum capacity of 1.5 litres under the hot water spout (Fig. 3);
34 C o l l e c t i o n
• press the OK button.Descaler runs off from the hot water spout into the container below.
The appliance displays:
APPLIANCE IN DESCALE
• the descale programme automatically performs a series of run offs and pauses to remove lime scale
deposits from inside the coffee maker.
• After about 30 minutes, the appliance displays:
RINSING FILL TANK
The appliance must now be rinsed through to eliminate residues of descaling solution from inside the appliance.
Proceed as follows:
• empty the water tank, rinse and fill with clean water.
• Reposition the tank.
• Empty the full container and then put it back under the hot water spout.
• Press the OK button. Hot water is run off from the spout into the container below and the appliance displays:
RINSING
• When the water tank is empty, the appliance displays the message:
RINSING COMPLETE PRESS OK
• Press the OK button and refill the water tank with clean water.
• The descale programme is now terminated and the appliance is ready to make coffee again.

as an appliance engineer sometimes the oven element can be at fault, although this always the case, it could be the thermostat also as they are both interplay when the oven is heating up, they could both be tripping the RCD as the earth is detecting that electricity is becoming live due to a component leaking electricity.
you could try replacing both of them with caution (turning the electricity off in the house ect.. using safety equipment)

a good site to use for those components is the following;

Spare Parts Accessories for Electrical Appliances QuickSpares

usually if they don't have the item in stock on the website you can use the contact option and they usually respond pretty quickly and let you know if they can get the item ( most likely )

sounds very much like a faulty element iff not check brushs on motor depending on age of machine

You need to descale the machine with descaling solution.
look at following link for instructions

DELONGHI

the fan element would have blown. it is not uncommon for an element to trip an rcd when it blows. you are on the right track, if you replace the element all your problems should go away